01 #include <stdio.h>
02 
03 int main()
04  {
05   int n, reverse = 0; 
06   printf("Enter a number to reverse:n");
07   scanf("%d",&n); 
08   
09   while (n != 0) 
10    {
11     reverse = reverse * 10; 
12     reverse = reverse + n%10; 
13     n = n/10; 
14    }
15     printf("Reverse of entered number is = %dn",reverse); 
16     
17  return 0; 
18  }

 OUTPUT :
 
 Enter a number to reverse:
 
 1234
 
 Reverse of entered number is = 4321