我需要一个以“比率”开头的行的建议......它不是在编译 [英] I need a suggestion for the the line that starts with "ratio"... it's not compiling

问题描述

以比率开头的以下程序行应该=

5√M/ m 

其中M是maxSpeedRpm和m minSpeedRpm。请帮忙，我正试图解决这个问题。

 #include< iostream> 
 #include< cmath> 
 using namespace std; 
 int 
 main0（）
 {
 int maxSpeedRpm，minSpeedRpm; 
双倍比率; 
 
 cout<< 以每分​​钟转数输入最大速度; 
 cin>> maxSpeedRpm; 
 cout<< 以每分​​钟转数输入最低速度; 
 cin>> minSpeedRpm; 
 
比率= sqrt（（pow（maxSpeedRpm / minSpeedRpm），（1/5）））; 
 
 cout<< 计算的比率是<<比; 
 
 cin.ignore（）; 
 cin.get（）; 
返回0; 
} 

解决方案

如果你穿插一些空白，你可以自己看看它为什么不编译：

 ratio = sqrt（（pow（maxSpeedRpm / minSpeedRpm），（1/5）））; 

所以你得了括号错了。你可能想写：

 ratio = sqrt（pow（（maxSpeedRpm / minSpeedRpm）， 0 。  2 ））; 

pow（）函数有两个参数...如下所示

c ++，cmath

  double  pow（ double   base ， double  exponent）; 
  long   double  pow（ long   double   base ， long   double  exponent）; 
  float  pow（ float   base ， float  exponent）; 
  double  pow（ double   base ， int  exponent）; 
  long   double  pow（ long   double   base ， int  exponent）; 

谢谢

Asp.Net C＃帮助博客 [ ^ ]

The following program line that starts with "ratio" is supposed to =

5√M/m

where M is maxSpeedRpm and m minSpeedRpm. Please help, I am going cross eyed trying to work this out.

#include <iostream>
#include <cmath>
using namespace std;
int
main0()
{
    int maxSpeedRpm, minSpeedRpm;
    double ratio;
    
    cout << "Enter the maximum speed in revolutions per minute";
    cin >> maxSpeedRpm;
    cout << "Enter the minimum speed in revolutions per minute";
    cin >> minSpeedRpm;
    
    ratio = sqrt((pow(maxSpeedRpm/minSpeedRpm),(1/5)));

    cout << "The calculated ratio is" << ratio;
       
    cin.ignore();
    cin.get();
    return 0;
}

解决方案

If you intersperse some blanks you can see for yourself why it doesn''t compile:

ratio = sqrt( (pow(maxSpeedRpm/minSpeedRpm), (1/5)) );

So you got the parenthese wrong. You probably meant to write:

ratio = sqrt (pow ((maxSpeedRpm/minSpeedRpm), 0.2));

pow() function having two arguments...as below
c++ , cmath

double pow (      double base,      double exponent );
long double pow ( long double base, long double exponent );
      float pow (       float base,       float exponent );
     double pow (      double base,         int exponent );
long double pow ( long double base,         int exponent );

Thanks
Asp.Net C# Help Blog[^]

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