A C language program that promotes the user to enter a number and then reverse it.

For example, if the user enters 5143, the function would reverse it so that it becomes 3415.

#include<stdio.h>

void main ()

{

          int num=0;

          clrscr();

          printf(" Enter a number to reverse : ");

          scanf("%d",&num);

          printf(" Reverse of %d is %d\n",num,reverse(num));

          getch();

}

int reverse(int num)

{

          int res=0,temp=num,k,a=0,i;

          /* finds the number or digits*/

          for(;temp/10!=0;temp/=10)

          a++;

          for(;num/10!=0;)

          {

          k=num%10;

          for(i=0;i<a;i++)

          {

          k*=10;

          }

          num/=10;

          a--;

          res+=k;

          if (num<10)

          res+=num;

          }

          return res;

}