1001 A+B Format (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 Specification:
Each input file contains one test case. Each case contains a pair of integers a and b where −106≤a,b≤106. The numbers are separated by a space.
Output Specification:
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 <iostream>
#include<cstdio>
#include<algorithm>
#include<string.h>
#include<string>
#include<stack>
using namespace std;
#pragma warning(disable:4996)
//15:53
stack<char> st;
int main() {
int a, b;
scanf("%d %d", &a, &b);
int sum = a + b;
if (sum < 0) {
printf("-");
sum = -sum;
}
char str[10];
sprintf(str, "%d", sum);
int j = 0;
for (int i = strlen(str) - 1; i >= 0; i--) {
if (j ==3) {
st.push(',');
j = 0;
}
st.push(str[i]);
j++;
}
while (!st.empty()) {
printf("%c", st.top());
st.pop();
}
return 0;
}