WAP to reverse a number using recursion

#include <stdio.h>
 #include <stdlib.h>

 int rec(int);
 int rev=0;
int main()
 {
 int num;
printf("enter the number");
 scanf("%d",&num);
 rec(num);
system("PAUSE");
 return(0);
 }
int rec(int n)
 {
if(n==0)
 { printf("%d",rev);
 return; }
 else
 rev=rev*10+n%10;
 rec(n/10);
}
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