1001 A+B Format
自己解法
#include <iostream>
#include <stdlib.h>
using namespace std;
int main()
{
int a, b;
cin >> a >> b;
string s = to_string(a + b);
int len = s.length();
for (int i = 0; i < len; i++)
{
cout << s[i];
if ((len - i - 1) % 3 == 0 && len - i - 1 != 0 && s[i] != '-')
cout << ',';
}
cout << "\n";
return 0;
}
大神解法
#include <iostream>
using namespace std;
int main() {
int a, b;
cin >> a >> b;
string s = to_string(a + b);
int len = s.length();
for (int i = 0; i < len; i++) {
cout << s[i];
if (s[i] == '-') continue;
if ((i + 1) % 3 == len % 3 && i != len - 1) cout << ",";
}
return 0;
}
总结
- string类型,to_string()
- 从后向前看,每三个且不是最后一个和不是符号就加逗号