没有什么难度,就是注意用printf保留两位小数
#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
double add(double x, double y)
{
double s;
s = x + y;
return s;
}
int main()
{
double x, y;
cin >> x >> y;
printf("%.2f", add(x, y));
return 0;
}