1001. A+B Format (20)

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本文分享了PAT甲级考试首题的解题经验及代码实现，题目要求计算两个整数之和并按标准格式输出，即每三位数字用逗号分隔。文章通过示例代码详细介绍了如何根据不同范围的数值输出正确格式。

今天开始刷PAT了，报了18号考试，剩下这几天一点信心都没有，甲级题库有139题，想把甲级题库刷完，压力山大，每天至少要8题，哎，我现在给自己定目标是5题，刷一半就好了。

说回本题，第一题就打击我了，我没认真看就以为是大数减价，立马开了个数组，做一个位运算，然后发现。。。他喵的原来只是考输出格式。

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

#include <stdio.h>
#include <stdlib.h>

int main()
{
    int a, b ,c, sum;
    scanf("%d %d", &a, &b);
    sum = a+b;
    c = abs(sum);
    if(c<1000)
        printf("%d", sum);
    else if(c>=1000 && c<1000000)
        printf("%d,%03d", sum/1000, c%1000);
    else
        printf("%d,%03d,%03d", sum/1000000, (c%1000000)/1000, (c%1000000)%1000);
    system("pause");
}