1001 A+B Format (20)(20 分)
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
作者: CHEN, Yue
单位: PAT联盟
时间限制: 400ms
内存限制: 64MB
代码长度限制: 16KB
#include<iostream>
#include<string>
using namespace std;
int main(){
int A,B,Sum=0;
string C;
cin>>A>>B;
Sum=A+B;
if(Sum<0) {
cout<<"-";
Sum=-Sum;
}
C=to_string(Sum);
int len=C.length();
if(len<4)
cout<<C;
else{
for(int i=0;i<len;i++){
if((len-i-1)%3==0&&(len-i-1)>0)
cout<<C[i]<<",";
else cout<<C[i];
}
}
cout<<endl;
return 0;
}先将负数转换成正数,然后判断(len-i-1)%3==0是否成立(由于最后一个位置不输出‘,’,所以还要使len-i-1>0)成立则输出‘,’。
本文介绍了一道 PAT 联盟的经典编程题——A+B Format 的解题思路及实现方法,通过 C++ 代码演示如何按标准格式输出加法结果。
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