在使用setprecision（）的C++幫助中

Question

當我運行該程序時，setprecision與所有變量一起工作。我試圖讓變量secondsinput成爲一個整數。我已經嘗試將該變量設置爲一個整數，但是這使得數學運算出來了。有任何想法嗎 ？

using namespace std; 

int main() 
{ 
double outputminutes, outputhours, outputdays, secondsinput; 

cout << "Please enter the number of seconds: "; 
cin >> secondsinput; 
cout << endl; 

outputminutes = secondsinput/60; 
outputhours = secondsinput/3600; 
outputdays = secondsinput/86400; 

cout << setprecision(2) << fixed; 

if (secondsinput > 60 && secondsinput < 3600) 
     cout << secondsinput << " seconds is " 
      << outputminutes << " minutes." 
      << endl << endl; 

else if (secondsinput > 3600 && secondsinput < 86400) 
     cout << secondsinput << " seconds is " 
      << outputhours << " hours." 
      << endl << endl; 
else if (secondsinput > 86400) 
    cout << secondsinput << " seconds is " 
      << outputdays << " days." 
      << endl << endl; 
} 

Answer 1

讓secondsinput的int，因爲這是你想要的輸入和顯示。只需修正數學。例如：

outputminutes = secondsinput/60.0; 
outputhours = secondsinput/3600.0; 
outputdays = secondsinput/86400.0; 

或

outputminutes = static_cast<double>(secondsinput)/60; 
outputhours = static_cast<double>(secondsinput)/3600; 
outputdays = static_cast<double>(secondsinput)/86400;