注意输出空格和保留小数位

#include <bits/stdc++.h>
using namespace std;
char a1;
int a;
float b;
double c;
int main(){
	cin>>a1>>a>>b>>c;
	cout<<a1<<" "<<a<<" "<<fixed<<setprecision(6)<<b<<" "<<c;
	return 0;
}