PAT(A) 1001. A+B Format (20)

原题目：

原题链接：https://www.patest.cn/contests/pat-a-practise/1001

1001. A+B Format (20)

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Calculate a + b and output the sum in standard format -- that is, the digits must be separated into groups of three by commas (unless there are less than four digits). Input Each input file contains one test case. Each case contains a pair of integers a and b where -1000000 <= a, b <= 1000000. The numbers are separated by a space. Output For each test case, you should output the sum of a and b in one line. The sum must be written in the standard format. Sample Input -1000000 9 Sample Output -999,991

解题报告

题目是两数相加，按标准形式输出。 方法很多，择一即可，需要注意的是0和负数还有和的结果中间部分是0的情况。

代码

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#include "stdio.h"
int main(){
    int a = 0;
    int b = 0;
    scanf("%d %d",&a,&b);
    int ans = a + b;
    int i = 0;
    int ansarr[5];
    if(ans == 0)
        printf("0");
    else{
        if(ans < 0){
            printf("-");
            ans = -ans;
        }
        while(ans){
            ansarr[i++] = ans % 1000;
            ans /= 1000;
        }
        printf("%d",ansarr[--i]);
        while(i--)
            printf(",%03d",ansarr[i]);
    }
}