PAT (Advanced Level) Practice 1001 A+B Format (20) C++

本题主要考察边界条件判断，数字取模取余运算。

#include <iostream>
#include <cstdio>
#include <string>
#include<iomanip>
using namespace std;
int main(void)
{
	long n,m;
	cin >> n >> m;
	long ad = n + m;	
	string s;
	if (ad >= 1000000) {
		cout << ad / 1000000 << "," << right << setw(3) << setfill('0')<< ad/1000%1000 << "," << right << setw(3) << setfill('0') <<ad % 1000;
	}
	else if (ad <= -1000000) {
		ad = -ad;
		cout <<"-"<< ad / 1000000 << "," << right << setw(3) << setfill('0') << ad / 1000 % 1000 << "," << right << setw(3) << setfill('0') << ad % 1000;
	}
	else if (-1000>=ad ) {
		ad = -ad;
		cout<<"-"<<ad/1000<<","<< right << setw(3) << setfill('0') << ad % 1000;
	}
	else if (ad >= 1000) {
		cout << ad / 1000 << "," << right << setw(3) << setfill('0') << ad % 1000;
	}
	else {
		cout << ad;
	}
}