C Language Program Collection

Write a program to accept two values a & b and interchange their values 
#include<stdio.h>
#include<conio.h>
main()
{
int a,b,temp;
clrscr();
printf("Enter Numbers: ");
scanf("%d%d",&a,&b);
printf("\nBefore Swapping..\na=%d,b=%d",a,b);
temp=a;
a=b;
b=temp;
printf("\nAfter Swapping..\na=%d,b=%d",a,b);
getch();
}
Program to show swap of two no’s without using third variable.
#include<stdio.h>
#include<conio.h>
void main()
{
int a,b;
clrscr();
printf(“enter value for a & b: ”);
scanf(“%d%d”,&a,&b);
a=a+b;
b=a-b;
a=a-b;
printf(“after swapping the value of a & b: %d %d”,a,b);
getch();
}
Program to find greatest in 3 numbers.
#include<stdio.h>
#include<conio.h>
void main()
{
int a,b,c;
clrscr();
printf(“enter value of a, b & c: ”);
scanf(“%d%d%d”,&a,&b,&c);
if((a>b)&&(a>c))
printf(“a  is  greatest”);
if((b>c)&&(b>a))
printf(“b is greatest”);
if((c>a)&&(c>b))
printf(“c  is  greatest”);
getch();
}  

write a program to calculate roots of a quadratic equations in C language x=b^2-4ac

if x=0 -> only one root ,

if x>0 -> roots are distinct (–b+x)/2a & (–b-x)/2a

if x roots are imaginary 
#include<stdio.h>
#include<conio.h>
main()
{
float x,r1,r2,a,b,c;
clrscr();
printf("Enter a,b,c…");
scanf("%f%f%f",&a,&b,&c);
x=b*b-4*a*c;
r1=(-b+x)/2*a;
r2=(-b-x)/2*a;
if(x>0)
printf("\nRoots are unequal…\n");
else if(x<0)
printf("\nRoots are imaginary…\n");
else
printf("\nRoots are same….\n");
printf("R1 = %f",r1);
printf("R2 = %f",r2);
getch();
}
Write a program to accept roll number ,and marks for three subjects, print total marks and 

average, also print grade by considering following conditions
 
Avg>=60 Grade A

Avg=50 Grade B

Avg=40 Grade C

Grade F. 
#include<stdio.h>
#include<conio.h>
main()
{
int RollNumber,m1,m2,m3,total;
float avg;
clrscr();
printf("Enter Roll Number : ");
scanf("%d",&RollNumber);
printf("Enter marks for three subjects : ");
scanf("%d%d%d",&m1,&m2,&m3);
total=m1+m2+m3;
avg=total/3.0;
printf("\nTotal is……. %d",total);
printf("\nAverage is….. %5.2f %",avg);
if(avg>=60)
printf("\nGrade : A");
else if((avg>=50)&&(avg<60))
printf("\nGrade : B");
else if((avg>=40)&&(avg<50))
printf("\nGrade : C");
else
printf("\nGrade : F");
getch();
}

Write a Program to accept a number and print the number in reverse order.

 E.g. if 1324 is the number then the output will be 4231 
 
#include<stdio.h>
#include<conio.h>
main()
{
int rem,n;
clrscr();
printf("Enter n : ");
scanf("%d",&n);
while(n>0)
{
rem=n%10;
printf("%d",rem);
n=n/10;
}
getch();
} 
Write a Program to accept a number and print sum of it’s digits 
#include<stdio.h>
#include<conio.h>
main()
{
int rem,sum=0,n
clrscr();
printf("Enter n : ");
scanf("%d",&n);
while(n>0)
{
rem=n%10;
sum=sum+rem;
n=n/10;
}
printf("Sum of digits….%d",sum);
getch();
} 
Write a program to accept a number from user and check it it is Armstrong number or not

 i.e. 153 = 1^3 + 5^3 + 3^3 = 153 
 
#include<stdio.h>
#include<conio.h>
main()
{
int i=2,temp,rem,sum=0 ,n;
clrscr();
printf("Enter n : ");
scanf("%d",&n);
temp=n;
while(n>0)
{
rem=n%10;
sum=sum+rem*rem*rem;
n=n/10;
}
if(temp==sum)
printf("Armstrong Number");
else
printf("Not an Armstrong Number");
getch();
} 
Write a program to print table of a given number n 
#include<stdio.h>
#include<conio.h>
main()
{
int i,n;
clrscr();
printf("Enter number : ");
scanf("%d",&n);
for(i=1;i<=10;i++)
printf("%d X %d = %d\n",n,i,n*i);
getch();
} 
Write a program to print sum of given first n numbers 
#include<stdio.h>
#include<conio.h>
main()
{
int n,newn,i,sum=0;
clrscr();
printf("enter number : ");
scanf("%d",&n);
printf("Numbers entered….\n");
for(i=1;i<=n;i++)
{
scanf("%d",&newn);
sum=sum+newn;
}
printf("Sum of given n digits is… %d",sum);
} 
Write a program to accept a number from user and print it’s factorial 

 Eg: factorial of 5 is:-5! = 5 * 4 * 3 * 2 * 1=120 
 
#include<stdio.h>
  #include<conio.h>
  main()
  {
  int i,fact=1,n;
  clrscr();
  printf("Enter number…");
  scanf("%d",&n);
  for(i=1;i<=n;i++)
  fact=fact*i;
  printf("facttorialof the given number is…%d",fact);
  getch();
   
  }
Write a program to accept a number from user and print if it is prime or not 
#include<conio.h>
#include<process.h>
main()
{
int i,n;
clrscr();
printf("Enter number…");
scanf("%d",&n);
for(i=2;i<=n/2;i++)
{
if(n%i==0)
{
printf("Not Prime");
getch();
exit(0);
}
}
printf("Prime ");
getch();
}
Write a program to accept a number and print prime numbers between 2 and n 
#include<stdio.h>
#include<conio.h>
#include<process.h>
main()
{
int i,flag=1,n,newn;
clrscr();
printf("Enter number…");
scanf("%d",&n);
for(newn=2;newn<=n;newn++)
{
flag=1;
for(i=2;i<=newn/2 ;i++)
{
if(newn%i==0)
{
flag=0;
break;
}
}
if(flag==1)
printf("%d ",newn);
}
getch();
} 
Write a program to accept a number and print fibonacci series upto that level 
#include<stdio.h>
#include<conio.h>
main()
{
int pre=1,cur=1,temp,i,n;
clrscr();
printf("Enter number…");
scanf("%d",&n);
printf("%d\t%d",pre,cur);
for(i=3;i<=n;i++)
{
temp=cur;
cur=pre+cur;
pre=temp;
printf("\t%d",cur);
}
getch();
} 
Write a program to accept a number n from user and Add n terms of the series 
 
1/2! + 2/3! + 3/4! + 4/5! + 5/6! + ……… 
#include<stdio.h>
#include<conio.h>
main()
{
int i,j,n;
float sum=0,fact=1;
clrscr();
printf("Enter number….");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
fact=1;
for(j=1;j<=i+1;j++)
fact=fact*j;
sum=sum+i/fact;
}
printf("Sum of the series….%f",sum);
getch();
}
  

Write a program to accept two numbers from user and print it’s addition,subtraction,multiplication,division 

  using different functions in C language
#include<stdio.h>
#include<conio.h>
int add(int x,int y)
{
return(x+y);
}
int sub(int x,int y)
{
return(x-y);
}
int mul(int x,int y)
{
return(x*y);
}
int div(int x,int y)
{
return(x/y);
}
main()
{
int a,b;
clrscr();
printf("Enter numbers : \n");
scanf("%d%d",&a,&b);
printf("\nAddition       : %d\n",add(a,b));
printf("\nSubtraction    : %d\n",sub(a,b));
printf("\nMultiplication : %d\n",mul(a,b));
printf("\nDivision       : %d\n",div(a,b));
getch();
} 
  
Write a program to accept a number from user and print it’s factorial, check if it prime or not , 

  and print it’s fibbonacci series using different functions in C language
#include<stdio.h>
#include<conio.h>
 
fact(int x)
{
int i,fact=1;
for(i=1;i<=x;i++)
fact=fact*i;
printf("Factorial is : %d",fact);
}
IsPrime(int x)
{
int i;
for(i=2;i<x-1;i++)
{
if(x%i==0)
{
printf("\nNot a Prime Number\n");
return 0;
}
}
printf("\nIt is a Prime number\n");
}
fibbo(int x)
{
int pre=1,cur=1,i,temp;
printf("%d %d",pre,cur);
for(i=3;i<=x;i++)
{
temp=cur;
cur=pre+cur;
pre=temp;
printf(" %d",cur);
}
}
main()
{
int n;
clrscr();
printf("Enter number…");
scanf("%d",&n);
fact(n);
IsPrime(n);
fibbo(n);
getch();
} 
  
Write a program using recursions for fibbonacci series in C language
#include<stdio.h>
#include<conio.h>
#include<process.h>
fibbo(int pre, int cur ,int x)
{        
int temp;
if(x==2)
{
getch();
exit(0);
}
temp=cur;
cur=pre+cur;
pre=temp;
printf("%d ",cur);
fibbo(pre,cur,x-1);
}
main()
{
int n,pre=1,cur=1;
clrscr();
printf("Enter number : ");
scanf("%d",&n);
printf("%d %d ",pre,cur);
fibbo(pre,cur,n);
getch();
} 
  
Write a program using reccursions for fibbionacci series factorial in C language
#include<stdio.h>
#include<conio.h>
#include<process.h>
int fact(int n)
{
int f;
if(n==1)
return 1;
else
f=n*fact(n-1);
return f;
}
main()
{
int n;
clrscr();
printf("Enter number : ");
scanf("%d",&n);
printf("\nFactorial is…%d\n",fact(n));
getch();
} 

Write a program to accept a number n from user and then accept n array elements from user 

  and reprint them in C language
#include<stdio.h> 
#include<conio.h>
main()
{
int n,i,a[20];
clrscr();
printf("Enter number…");
scanf("%d",&n);
printf("Enter array elements :\n" );
for(i=0;i<n;i++)
{
printf("Enter element %d : ",i+1);
scanf("%d",&a[i]);
}
for(i=0;i<n;i++)
printf("\nElement %d : %d",i+1,a[i]);
getch();
} 
  
Write a program to accept a number n from user and then accept n array elements from user and 

  reprint them in reverse order of inputs in C language
#include<stdio.h> 
#include<conio.h>
main()
{
int n,i,a[20];
clrscr();
printf("Enter number…");
scanf("%d",&n);
printf("Enter array elements :\n" );
for(i=0;i<n;i++)
{
printf("Enter element %d : ",i+1);
scanf("%d",&a[i]);
}
for(i=n-1;i>=0;i–)
printf("\nElement %d : %d",i+1,a[i]);
getch();
} 
  
Write a program to accept a number n from user and then accept n array elements from user and 

  print addition of those n array elements in C language
#include<stdio.h> 
#include<conio.h> 
main() 
{ 
int n,i,a[20],sum=0; 
clrscr(); 
printf("Enter number…"); 
scanf("%d",&n); 
printf("Enter array elements :\n" ); 
for(i=0;i<n;i++) 
{ 
printf("Enter element %d : ",i+1); 
scanf("%d",&a[i]); 
} 
  
for(i=0;i<n;i++) 
sum=sum+a[i]; 
printf("\nSum of given array elements is : %d",sum); 
getch(); 
} 
  
Write a program to accept a number n from user and print fibbonacci series up to nth level

   using arrays in C language
#include<stdio.h> 
#include<conio.h> 
main() 
{ 
int a[20],n,i; 
clrscr(); 
printf("Enter number : "); 
scanf("%d",&n); 
a[1]=a[2]=1; 
  
for(i=3;i<=n;i++) 
a[i]=a[i-1]+a[i-2]; 
  
for(i=1;i<=n;i++) 
printf(" %d",a[i]); 
  
getch(); 
} 
  
Write a program to accept a number n from user and then accept n array elements from user and

  print maximum and minimum array element from that set of array in C language
#include<stdio.h> 
#include<conio.h> 
main() 
{ 
int n,i,a[20],max,min; 
clrscr(); 
printf("Enter number : "); 
scanf("%d",&n); 
printf("Enter array elements…\n"); 
for(i=0;i<n;i++) 
{ 
printf("Enter element %d : ",i+1); 
scanf("%d",&a[i]); 
} 
max=min=a[0]; 
for(i=0;i<n;i++) 
{ 
if(a[i]>max) 
max=a[i]; 
if(a[i]<min) 
min=a[i]; 
} 
printf("\nMin : %d",min); 
printf("\nMax : %d",max); 
getch(); 
} 
  
Write a program to accept a number n from user and then accept n array elements from user, 

  print positive & Negative numbers separately in C language
#include<stdio.h> 
#include<conio.h> 
main() 
{ 
int n,i,a[20]; 
clrscr(); 
printf("Enter number : "); 
scanf("%d",&n); 
printf("Enter array elements…\n"); 
for(i=0;i<n;i++) 
{ 
printf("Enter element %d : ",i+1); 
scanf("%d",&a[i]); 
} 
  
printf("\n\nNegative Elements : \n"); 
for(i=0;i<n;i++) 
if(a[i]<0) 
printf("\n%d",a[i]); 
  
printf("\n\nPositive Elements : \n"); 
for(i=0;i<n;i++) 
if(a[i]>0) 
printf("\n%d",a[i]); 
  
getch(); 
} 
  
Write a program to accept a number n from user and then accept n array elements from user, 

  print these array elements in ascending and descending order in C language
#include<stdio.h> 
#include<conio.h> 
main() 
{ 
int n,i,a[20],j,max,min,temp; 
clrscr(); 
printf("Enter number : "); 
scanf("%d",&n); 
printf("Enter array elements…\n"); 
for(i=0;i<n;i++) 
{ 
printf("Enter element %d : ",i+1); 
scanf("%d",&a[i]); 
} 
max=a[0]; 
for(i=0;i<n;i++) 
{ 
for(j=0;j<i;j++) 
if(a[i]>a[j]) 
{ 
temp=a[i]; 
a[i]=a[j]; 
a[j]=temp; 
} 
} 
printf("Ascending order…..\n"); 
for(i=0;i<n;i++) 
{ 
printf(" %d  ",a[i]); 
} 
  
min=a[0]; 
for(i=0;i<n;i++) 
{ 
for(j=0;j<i;j++) 
if(a[i]<a[j]) 
{ 
temp=a[i]; 
a[i]=a[j]; 
a[j]=temp; 
} 
} 
printf("\nDescending order….\n"); 
for(i=0;i<n;i++) 
{ 
printf(" %d  ",a[i]); 
} 
  
getch(); 
} 
  

Write a program to accept a mXn matrix and reprint it in matrix form in C language
#include<stdio.h>
#include<conio.h>
main()
{
int i,j,m,n,a[5][5];
clrscr();
printf("Enter order of matrix :\n");
scanf("%d%d",&m,&n);
printf("Enter matrix elements…..\n");
for(i=0;i<m;i++)
for(j=0;j<n;j++)
scanf("%d",&a[i][j]);
 
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
printf("%d ",a[i][j]);
printf("\n");
}
getch();
} 
  
Write a program to accept two mXn matrices and add them 
#include<stdio.h>
#include<conio.h>
main()
{
int i,j,m,n,a[5][5],b[5][5],c[5][5];
clrscr();
printf("Enter order of matrix :\n");
scanf("%d%d",&m,&n);
printf("Enter matrix elements of first matrix…..\n");
for(i=0;i<m;i++)
for(j=0;j<n;j++)
scanf("%d",&a[i][j]);
printf("Enter matrix elements of second matrix…..\n");
for(i=0;i<m;i++)
for(j=0;j<n;j++)
scanf("%d",&b[i][j]);
for(i=0;i<m;i++)
for(j=0;j<n;j++)
c[i][j]=a[i][j]+b[i][j];
printf("Resultant matrix …..\n");
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
printf("%d ",c[i][j]);
printf("\n");
}
getch();
} 
  
Write a program to accept a mXn matrix and print addition of their array elements 
#include<stdio.h>
#include<conio.h>
main()
{
int i,j,m,n,a[5][5],sum=0;
clrscr();
printf("Enter order of matrix :\n");
scanf("%d%d",&m,&n);
printf("Enter matrix elements…..\n");
for(i=0;i<m;i++)
for(j=0;j<n;j++)
scanf("%d",&a[i][j]);
for(i=0;i<m;i++)
for(j=0;j<n;j++)
sum=sum+a[i][j];
printf("\nSum of matrix elements…..%d",sum);
getch();
} 
  
Write a program to accept a nXn matrix and print addition of digonal elements of that matrix 
#include<stdio.h>
#include<conio.h>
main()
{
int i,j,m,a[5][5],sum=0;
clrscr();
printf("Enter order of matrix :\n");
scanf("%d",&m);
printf("Enter matrix elements…..\n");
for(i=0;i<m;i++)
for(j=0;j<m;j++)
scanf("%d",&a[i][j]);
for(i=0;i<m;i++)
for(j=0;j<m;j++)
if(i==j)
sum=sum+a[i][j];
printf("\nSum of diagonal elements…..%d",sum);
getch();
} 
  
Write a program to accept a N x N matrix and print addition of upper triangular matrix elements 
#include<stdio.h>
#include<conio.h>
main()
{
int i,j,m,a[5][5],sum=0;
clrscr();
printf("Enter order of matrix :\n");
scanf("%d",&m);
printf("Enter matrix elements…..\n");
for(i=0;i<m;i++)
for(j=0;j<m;j++)
scanf("%d",&a[i][j]);
for(i=0;i<m;i++)
for(j=0;j<m;j++)
if(i<j)
sum=sum+a[i][j];
printf("\nSum of upper triangular elements…..%d",sum);
getch();
} 
  
Write a program to accept a N x N matrix and print addition of lower triangular matrix elements 
#include<stdio.h>
#include<conio.h>
main()
{
int i,j,m,a[5][5],sum=0;
clrscr();
printf("Enter order of matrix :\n");
scanf("%d",&m);
printf("Enter matrix elements…..\n");
for(i=0;i<m;i++)
for(j=0;j<m;j++)
scanf("%d",&a[i][j]);
for(i=0;i<m;i++)
for(j=0;j<m;j++)
if(i>j)
sum=sum+a[i][j];
printf("\nSum of lower triangular elements…..%d",sum);
getch();
} 
  
Write a program to accept two m X n matices and print their addition and multiplication 
#include<stdio.h>
#include<conio.h>
main()
{
int i,j,m,n,k,a[5][5],b[5][5],c[5][5];
clrscr();
printf("Enter order of matrix :\n");
scanf("%d%d",&m,&n);
printf("Enter matrix elements of first matrix…..\n");
for(i=0;i<m;i++)
for(j=0;j<n;j++)
scanf("%d",&a[i][j]);
 
printf("Enter matrix elements of second matrix…..\n");
for(i=0;i<m;i++)
for(j=0;j<n;j++)
scanf("%d",&b[i][j]);
for(i=0;i<m;i++)
for(j=0;j<n;j++)
{
c[i][j]=0;
for(k=0;k<n;k++)
c[i][j]=c[i][j]+a[i][k]*b[k][j];
}
printf("Resultant matrix …..\n");
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
printf("%d ",c[i][j]);
printf("\n");
}
getch();
} 
   
Write a program to accept a m X n matrix and print it’s transpose matrix 
#include<stdio.h>
#include<conio.h>
main()
{
int i,j,m,n,a[5][5];
clrscr();
printf("Enter order of matrix :\n");
scanf("%d%d",&m,&n);
printf("Enter matrix elements…..\n");
for(i=0;i<m;i++)
for(j=0;j<n;j++)
scanf("%d",&a[i][j]);
for(i=0;i<m;i++)
{
for(j=0;j<n;j++)
printf("%d ",a[j][i]);
printf("\n");
}
getch();
} 
  

Write a program to accept a string and print the string in reverse order 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
char *s1;
clrscr();
printf("Enter string : ");
scanf("%s",s1);
printf("Reverse String : %s",strrev(s1));
getch();
} 
Write a program to calculate lenght of a given string 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
char *s1;
clrscr();
printf("Enter string : ");
scanf("%s",s1);
printf("Lenght: %d",strlen(s1));
getch();
} 
Write a program to accept a string and print the string in upper case 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
char *s1;
clrscr();
printf("Enter string:");
scanf("%s",s1);
printf("String in UPPER CASE : %s",strupr(s1));
getch();
} 
Write a program to accept a string and print the string in lower case 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
char *s1;
clrscr();
printf("Enter string: ");
scanf("%s",s1);
printf("String in lower case : %s",strlwr(s1));
getch();
} 
Write a program to accept a string and print no. of aphlabets, digits, special symbols present in it 
##include<stdio.h>
#include<conio.h>
#include<string.h>
#include<ctype.h>
main()
{
char *s;
int i,alpha=0,digit=0,symbol=0;
clrscr();
printf("Enter string : ");
scanf("%s",s);
for(i=0;s[i]!=’\0';i++)
 
if(isalpha(s[i]))
alpha++;
else if(isdigit(s[i]))
digit++;
else
symbol++;
 
printf("\nAphabets : %d",alpha);
printf("\nDigits : %d",digit);
printf("\nSymbols : %d",symbol);
getch();
} 
Write a program to accept two strings and compare them 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
char *s1,*s2;
clrscr();
printf("Enter string 1 : ");
scanf("%s",s1);
printf("Enter string 2 : ");
scanf("%s",s2);
 
if(strcmp(s1,s2)>0)
printf("\nString 1 is greater..");
else if(strcmp(s1,s2)<0)
printf("\nString 2 is greater..");
else
printf("\nStrings are equal..");
 
getch();
} 
Write a program to accept two strings and concatenate them 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
char *s1,*s2;
clrscr();
printf("Enter string 1 : ");
scanf("%s",s1);
printf("Enter string 2 : ");
scanf("%s",s2);
printf("\nCocatinated string is…%s",strcat(s1,s2));
getch();
} 
Write a program to accept a string and copy it into another string 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
char *s1,*s2;
clrscr();
printf("Enter string 1 : ");
scanf("%s",s1);
strcpy(s2,s1);
printf("\nCopied string is…%s",s2);
getch();
} 
Write a program to print length of a given string 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
int i,len=0;
char *s;
clrscr();
printf("Enter the string….");
scanf("%s",s);
for(i=0;s[i]!=’\0';i++)
len++;
printf("The lenth of the string is…%d",len);
getch();
} 
Write a program to copy a string into another string 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
int i;
char *s1,*s2;
clrscr();
printf("Enter the string 1….");
scanf("%s",s1);
for(i=0;s1[i]!=’\0';i++)
{
s2[i]=s1[i];
}
s2[i]=’\0';
printf("The copied string is…%s",s2);
getch();
} 
Write a program to convert given string to UPPER CASE 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
int i;
char *s1;
clrscr();
printf("Enter the string 1….");
scanf("%s",s1);
 
for(i=0;s1[i]!=’\0';i++)
{
if((s1[i]>=’a’)&&(s1[i]<=’z’))
s1[i]=s1[i]-32;
}
printf("Resultant string is…%s",s1);
getch();
} 
Write a program to convert givern string to lower case 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
int i;
char *s1;
clrscr();
printf("Enter the string 1….");
scanf("%s",s1);
 
for(i=0;s1[i]!=’\0';i++)
{
if((s1[i]>=’A’)&&(s1[i]<=’Z’))
s1[i]=s1[i]+32;
}
 
printf("Resultant string is…%s",s1);
getch();
} 
Write a program to concatinate two strings 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
int i,len=0,j;
char *s1,*s2;
clrscr();
printf("Enter the string 1….");
scanf("%s",s1);
printf("Enter the string 2….");
scanf("%s",s2);
 
for(i=0;s1[i]!=’\0';i++)
{
len++;
}
j=0;
for(i=len;s2[j]!=’\0';i++)
{
s1[i]=s2[j];
j++;
}
s1[i]=’\0';
 
printf("Resultant string is…%s",s1);
getch();
} 
Write a program to count no, of alphlabets, digits, special symbols 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
int i,alpha=0,digit=0,symbol=0;
char *s;
clrscr();
printf("Enter the string 1….");
scanf("%s",s);
 
for(i=0;s[i]!=’\0';i++)
{
if(((s[i]>=’A’)&&(s[i]<=’Z’))||((s[i]>=’a’)&&(s[i]<=’z’)))
alpha++;
else if((s[i]>=’0’)&&(s[i]<=’9’))
digit++;
else
symbol++;
}
printf("\nAlphabets : %d",alpha);
printf("\nDigits : %d",digit);
printf("\nSymbols : %d",symbol);
getch();
}
Write a program to compare two strings in C language
#include<stdio.h>
#include<conio.h>
#include<string.h>
#include<process.h>
main()
{
int i;
char *s1,*s2;
clrscr();
printf("Enter the string 1….");
scanf("%s",s1);
printf("Enter the string 2….");
scanf("%s",s2);
 
for(i=0;s1[i]!=’\0';i++)
{
if(s1[i]!=s2[i])
{
if(s1[i]>s2[i])
printf("\nString 1 is greater…");
else
printf("\nString 2 is greater…");
getch();
exit(0);
}
}
printf("String are equal….");
getch();
} 
Write a program to count all vowels present in the string 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
int i,vowel=0;
char *s;
clrscr();
printf("Enter the string 1….");
scanf("%s",s);
 
for(i=0;s[i]!=’\0';i++)
{
if((s[i]==’A’)||(s[i]==’E’)||(s[i]==’O’)||(s[i]==’U’)||(s[i]==’I’)||
(s[i]==’a’)||(s[i]==’e’)||(s[i]==’o’)||(s[i]==’u’)||(s[i]==’i’))
vowel++;
}
printf("\nVowels : %d",vowel);
getch();
} 
Write a program to reverse the given string 
#include<stdio.h>
#include<conio.h>
#include<string.h>
main()
{
int i,j,len=0;
char *s1,*s2;
clrscr();
printf("Enter the string ….");
scanf("%s",s1);
for(i=0;s1[i]!=’\0';i++)
len++;
j=0;
for(i=len-1;i>=0;i–)
{
s2[j]=s1[i];
j++;
}
s2[j]=’\0';
printf("\nReversed String : %s",s2);
getch();
} 
Write a program to check if the given string is palindrome or not E.g. NITIN, LIRIL. 
#include<stdio.h>
#include<conio.h>
#include<string.h>
#include<process.h>
main()
{
int i,j,len=0;
char *s1,*s2;
clrscr();
printf("Enter the string ….");
scanf("%s",s1);
for(i=0;s1[i]!=’\0';i++)
len++;
j=0;
for(i=len-1;i>=0;i–)
{
s2[j]=s1[i];
j++;
}
s2[j]=’\0';
for(i=0;s1[i]!=’\0';i++)
if(s1[i]!=s2[i])
{
printf("\nNot a palindrome");
getch();
exit(0);
}
printf("Palindrome");
getch();
}

Define a structure Employee having elements emp_id, name,etc. Accept data and reprint it
#include<stdio.h>
#include<conio.h>
struct Employee
{
char name[50];
int emp_id;
long phone_no;
};
main()
{
struct Employee e;
clrscr();
printf("Enter name : ");
scanf("%s",&e.name);
printf("Enter emp_id: ");
scanf("%d",&e.emp_id);
printf("Enter Phone Number: ");
scanf("%ld",&e.phone_no);
 
printf("\n\nEnter name : %s",e.name);
printf("\n\nEnter Emp Id : %d",e.emp_id);
printf("\n\nEnter Phone Number : %ld ",e.phone_no);
 
getch();
} 
Define a structure Student having fields roll_no, name, marks, etc, for 5 students, accept data and reprint
#include<stdio.h>
#include<conio.h>
struct Student
{
char name[50];
int roll_no;
int m1,m2,m3;
};

main()
{ int i;
struct Student s[5];
clrscr();
for(i=0;i<5;i++)
{ 
printf("\nEnter data for Student %d…..\n",i+1);
printf("Enter name : ");
scanf("%s",&s[i].name);
printf("Enter Roll No. : ");
scanf("%d",&s[i].roll_no);
printf("Enter marks for sub1 : ");
scanf("%d",&s[i].m1);
printf("Enter marks for sub2 : ");
scanf("%d",&s[i].m2);
printf("Enter marks for sub3 : ");
scanf("%d",&s[i].m3);
}
for(i=0;i<5;i++)
{ printf("\nStudent %d\n",i+1);
printf("Name : %s\n",s[i].name);
printf("Roll No.: %d\n",s[i].roll_no);
printf("Sub1 : %d\n",s[i].m1);
printf("Sub2 : %d\n",s[i].m2);
printf("Sub3 : %d\n",s[i].m3);
}
getch();
}
Define a structure Employee having elements emp_id, name, DOB, DOJ 

etc. Accept data and reprint it. (use structure within structure)
#include<stdio.h>
#include<conio.h>
struct Date
{
int mm,dd,yy;
};
struct Employee
{
char name[50];
int emp_id;
struct Date DOB,DOJ;
};
main()
{ int i;
struct Employee e;
clrscr();
printf("\nEnter name : ");
scanf("%s",&e.name);
printf("\nEnter emp_id. : ");
scanf("%d",&e.emp_id);
printf("\nEnter Date of Joining\n ");
printf("(dd-mm-yy) : ");
scanf("%d-%d-%d", &e.DOJ.dd,&e.DOJ.mm,&e.DOJ.yy);
printf("\nEnter Date of birth\n ");
printf("(dd-mm-yy) : ");
scanf("%d-%d-%d", &e.DOB.dd,&e.DOB.mm,&e.DOB.yy);
printf("\nName : %s",e.name);
printf("\nEmployee ID : %d",e.emp_id);
printf("\nEnter DOJ : %d-%d-%d", e.DOJ.dd,e.DOJ.mm,e.DOJ.yy);
printf("\nEnter DOB : %d-%d-%d", e.DOB.dd,e.DOB.mm,e.DOB.yy);
getch();
}