c++ - 我无法获得在 C++ 中工作的设置精度

Question

我无法获得在 C++ 中工作的设置精度。我一直得到小数点后 3 位而不是 1 位。如果我出 7 和 32 进，shootp 结果为 21.875。我需要它以 21.9 的形式出现。我在这方面还很陌生，我需要任何帮助!谢谢

#include <iostream>
#include <iomanip>

using  namespace std;

int main()
{
    int scored, attmp;

    cout<<"Enter the number of goals that were scored: ";
    cin>> scored;                                                   

    if( scored < 0 )
    {
        cout<<"Error: The number of goals must be greater than 0. Try Again: 
        ";
        cin>> scored; 
    }

    if( scored > 0 )
    {

    }
    cout<<"\nEnter the number of shots that were attempted: ";
    cin>>attmp;                                                     

    if( attmp < 0 )
    {
        cout<<"Error: The number of goal must be greater that 0. Try again: 
        ";
        cin>> attmp;
    }

    if( attmp >0 )
    {

    }

    double shootp= ((double)scored) / (attmp) * 100.0;      

    cout<<"\nThe Shooting Percentage is "<< shootp << setprecision(1) << 
endl;   
return 0;       
}

Answer 1

您需要同时使用 std::fixed机械手和 std::setprecision输出浮点变量之前的对象:

std::cout << "The Percentage is " << std::fixed << setprecision(1) << shootp << '\n';

这将产生 21.9 的输出。单独使用 std::setprecision 将在标准输出上产生 2e+01。