1357번 : 뒤집힌 덧셈

#include<cstdio>
int rev(int n);
int main()
{
    int x, y;
    scanf("%d %d", &x, &y);
    printf("%d", rev(rev(x) + rev(y)));
}
int rev(int n)
{
    int thN, hN, teN, oN;
    thN = n / 1000;
    n -= (thN * 1000);
    hN = n / 100;
    n -= (hN * 100);
    teN = n / 10;
    oN = n % 10;
    if (thN > 0)
        return oN * 1000 + teN * 100 + hN * 10 + thN;
    else if (hN > 0)
        return oN * 100 + teN * 10 + hN;
    else if (teN > 0)
        return oN * 10 + teN;
    else
        return oN;
}