Question

c++中提示 'setprecision' was not declared in this scope什么意思

#include<iostream>
using namespace std;
int main()
{
int time,money,howmoney;
cin>>money>>time;
if(money<=2)
{
howmoney=6;
}
else if(money>2&&money<=10)
{
howmoney=money*1.8;
}
else
howmoney=money*(1.8*1.5);
if(time>0)
{
howmoney=howmoney+time/3*1;
}

cout<<fixed<<setprecision(4)<<howmoney<<"元";

return 0;
}

Answer 1

setprecision不是<iostream>头文件中所包括的内容，是<iomanip>头文件包含的，所以要在最前面加上一句话：#include <iomanip>

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
int time,money,howmoney;
cin>>money>>time;
if(money<=2)
{
howmoney=6;
}
else if(money>2&&money<=10)
{
howmoney=money*1.8;
}
else
howmoney=money*(1.8*1.5);
if(time>0)
{
howmoney=howmoney+time/3*1;
}

cout<<fixed<<setprecision(4)<<howmoney<<"元"; 

return 0;
}

Answer 2

//加上这个试试
#include <iomanip>