杭电1720---A+B Coming（技巧：使用%x）

Problem Description

Many classmates said to me that A+B is must needs.
If you can’t AC this problem, you would invite me for night meal. ^_^

Input

Input may contain multiple test cases. Each case contains A and B in one line.
A, B are hexadecimal number.
Input terminates by EOF.

Output

Output A+B in decimal number in one line.

Sample Input

1 9 A B a b

Sample Output

10 21 21

题解：

#include<cstdio>
#include<iostream>
#include<cmath>
using namespace std;
int main()
{
    int a,b,ans;
    while (scanf_s("%x%x",&a,&b)!=EOF)
    {
        ans = a + b;
        cout<<ans<<endl;
    }
    return 0;
}
注意：ASCII码本身是十六进制，所以输入时用%x.