蓝桥杯算法提高VIP-大数加法 （C语言代码）

#include "stdafx.h"

#include "string.h"

#define max 1000

void reverse(int len, char a[])

{

    int i,t;

    for (i = 0; i < len/2; i++)

     {

         t = a[i];

         a[i] = a[len - 1 - i];

         a[len - 1 - i] = t;

     }

}

int stoi(char a)

{

     if (a == 0)

         return 0;

     else

         return a - '0';

}

int main()

{

     char a[max] = { 0 }, b[max] = { 0 };

     int c[max+1] = { 0 };

     int len_a, len_b,len_max,i,flag=0,k;

     scanf("%s %s", a, b);                                         //单行测试是对的，多行测试？？？？

     len_a = strlen(a);

     len_b = strlen(b);

     len_max = len_a > len_b ? len_a : len_b;

     reverse(len_a, a);

     reverse(len_b, b);

     for (i = 0; i < len_max; i++)

         {

             c[i] = stoi(a[i]) + stoi(b[i]) + flag;

             flag = c[i]/10;

             c[i]%=10;

         }

     c[i] = flag;

     k = flag==1?i:i-1;

     for (i = k; i >= 0; i--)

         printf("%d", c[i]);

     return 0;

}