/C++/Sum of first and last digit of a number in C++

Sum of first and last digit of a number in C++

#include<stdio.h>
void main()
{
    int a;
    scanf("%d",&a);
    int sum=0,r,t;
    t=a;
    while(a!=0)
    {
        r=a%10;
        sum=sum*10+r;
        a=a/10;
    }

    if(t==sum)
    {
        printf("%d",(sum+t)%100);
    } else
        printf("%d",(sum+t)%10);
}

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