hdoj1002

#include<iostream>
#include<string.h>
using namespace std;
void add(char a[], char b[], char tmp[]);
int main()
{
    int t;
    cin >> t;
    for(int i = 1; i <= t; i++)
    {
        char a[1005], b[1005], tmp[1005];
        a[0] = b[0] = '0';
        scanf("%s %s", &a[1], &b[1]);
        add(a, b, tmp);
        printf("Case %d:\n", i);
        printf("%s + %s = ", &a[1], &b[1]);
        if(tmp[0] != '0') printf("%c",tmp[0]);
        printf("%s\n", &tmp[1]);
        if(i != t)
        cout << endl;
    }
    return 0;
}

void add(char a[], char b[], char tmp[])
{
    int carry = 0, t;
    int sza = strlen(a), szb = strlen(b);
    int sz = (sza > szb)? sza: szb;
    tmp[sz] = '\0';
    for(int i = sz - 1; i >= 0; i--)
    {
        sza--; szb--; 
        if(sza >= 0 && szb < 0)
        {
            t = a[sza]-48 + carry, carry = 0;
            if(t > 9)
                tmp[i] = t - 10 +48, carry = 1;
            else 
                tmp[i] = t + 48;
        }
        if(szb >= 0 && sza < 0)
        {
            t = b[szb] - 48 + carry, carry = 0;
            if(t > 9)
                tmp[i] = t - 10 + 48, carry = 1;
            else 
                tmp[i] = t + 48;
        }
        if(sza >= 0 && szb >= 0)
        {
            t = a[sza] - 48 + b[szb] - 48 + carry, carry = 0;
            if(t > 9)
                tmp[i] = t - 10 + 48, carry = 1;
            else 
                tmp[i] = t + 48;
        }
    }
}