HDOJ1004

#include<iostream>
#include "cstring"
using namespace std;
int add(char s1[],char s2[])
{
    int a[1001]={0},b[1001]={0};//当a[1000]时出错会在最后出现一个1
    int strlen1 = strlen(s1);
    int strlen2 = strlen(s2);
    for(int i=(strlen1-1),j=0;i>=0;i--)//如何将字符串数字转换为数字数组
        a[j++] = s1[i] - ‘0‘;
    for(int i=(strlen2-1),j=0;i>=0;i--)//将字符串调转输入
        b[j++] = s2[i] - ‘0‘;

    for(int i=0;i<1000;i++)
    {
        a[i] = a[i] + b[i];
        if (a[i] >= 10)
        {
            a[i] = a[i] - 10;
            a[i + 1]++;
        }
    }
    int i;
    for(i=1000;i>=0&&a[i]==0;i--); //将i定位到数组的有效端

    for( ;i>=0;i--)
        cout << a[i];


    return 0;
}
int main() {
    int n;
    char a[1000], b[1000];
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> a >> b;
        cout << "Case " << i + 1 << ":" << endl;
        cout << a << " + " << b << " = ";
        add(a, b);
        cout << endl;
        if (i != (n - 1))
            cout << endl;

    }

    return 0;
}