當我“掏出”一個物體時出現的問題

Question

我cout函數時遇到問題。 下一個代碼是IDE給我錯誤的地方：

cout << "La cuerda de raiz tiene valor de: "<< chord.rootChord(const clsSpanCalculation&)
     << "La cuerda de punta tiene valor de: " << chord.tipChord(clsSpanCalculation &sC);

clsSpanCalculation和clsChordParameters類在main中分別定義為span和chord。

我正在使用標頭，在那里開發了類。 標頭是這些：

#ifndef __IASS_Project__wingSizing__
#define __IASS_Project__wingSizing__

#include <stdio.h>
#include <cmath>

class clsSpanCalculation{
    float wingArea, aspectRatio;
public:
    clsSpanCalculation(){}
    float get_wingArea(void)const{return wingArea;}
    void set_wingArea(float Sw){wingArea = Sw;}
    float get_aspectRatio(void)const{return aspectRatio;}
    void set_aspectRatio(float AR){aspectRatio = AR;}

    float span()const{
        float span;
        span = sqrt(aspectRatio*wingArea);
        return span;
    }
};

class clsChordParameters{
    float percentRectArea, percertTrapArea, taperRatio;
public:
    float get_percentRectArea(void)const{return percentRectArea;}
    void set_percentRectArea(float Srect){percentRectArea = Srect;}
    float get_percentTrapArea(void)const{return percertTrapArea;}
    void set_percentTrapArea(float Strap){percertTrapArea = Strap;}
    float get_taperRatio(void)const{return taperRatio;}
    void set_taperRatio(float lambda){taperRatio = lambda;}

    float rootChord (const clsSpanCalculation &clsSpanCalculation){
        float rootChord, lambdaplus;
        lambdaplus= taperRatio + 1;
        rootChord = (2*(clsSpanCalculation.get_wingArea()*(percentRectArea*(lambdaplus)+(2*percertTrapArea))))/((clsSpanCalculation.span()*lambdaplus)/2);
        return rootChord;
    }

    float tipChord (const clsSpanCalculation &sC){
        float rootChord, tipChord, lambdaplus;
        lambdaplus= taperRatio + 1;
        rootChord = (2*(sC.get_wingArea()*(percentRectArea*(lambdaplus)+(2*percertTrapArea))))/((sC.span()*lambdaplus)/2);
        tipChord = rootChord*taperRatio;
        return tipChord;
    }
};

#endif /* defined(__IASS_Project__wingSizing__) */

IDE給我的錯誤是這樣的： expected primary-expression before "const"

Answer 1

這段代碼看起來不對

 cout << "La cuerda de raiz tiene valor de: "<< chord.rootChord(const clsSpanCalculation&)
 << "La cuerda de punta tiene valor de: " << chord.tipChord(clsSpanCalculation &sC);

您的rootchord（）和tipchord（）函數期望將clsSpanCalculation對象傳遞給您

     const clsSpanCalculation&  // error no object is declared
     const clsSpanCalculation& sC //error you are passing the address of C but the tipchord() expects the object C not its address

您要做的是使這些類成為對象，然后通過

  cout << "La cuerda de raiz tiene valor de: "<< chord.rootChord(clsSpanCalculation C)// you still have to initialise C an sC
  cout<< "La cuerda de punta tiene valor de: " << chord.tipChord(clsSpanCalculation sC);