POJ1503——字符串——Integer Inquiry

#include<cstdio>
#include<cstring>
using namespace std;
int sum[150];
void add(char *a)
{
  int len = strlen(a);
  int k = 1;
  for(int i = len - 1 ;i >= 0;i--){
        sum[k] += (a[i] - ‘0‘);
        sum[k+1] += sum[k]/10;
        sum[k] %= 10;
        k++;
  }
}
 int main()
 {
     char a[105][105];
     for(int i = 0 ; ; i++){
        scanf("%s",a[i]);
        int n = strlen(a[i]);
        if(n == 1 && a[i][0] == ‘0‘)
            break;
        add(a[i]);
     }
    int flag = 0;
    for(int i = 110; i >= 1 ;i--){
      if(sum[i] == 0 && flag == 0)
        continue;
      else {
            flag = 1;
      printf("%d",sum[i]);
     }
    }
    return 0;
 }