"Not an allowed type" 在 Turbo C++ 中

Question

我正在尝试进行评分 system.So 我想做的是取 outputgrade 值的 1/3 并加上 [= 值的 2/3 13=]，我尝试了 midterm1=(outputgrade()*1/3)+(outputgrade2*2/3) 但我收到一个错误

Not an allowed type

请有人帮助我做什么。

#include<iostream.h>
#include<conio.h>
#include<iomanip.h>

double AAO,Quizzes,Project,MajorExam,Midterm;


void inputprelim()
    {
        clrscr();
        gotoxy(3,4);cout<<"Input Prelim Grade";
        gotoxy(1,6);cout<<"Attendance/Ass./Oral: ";cin>>AAO;
        gotoxy(1,7);cout<<"Project: ";cin>>Project;
        gotoxy(1,8);cout<<"Quizzes: ";cin>>Quizzes;
        gotoxy(1,9);cout<<"Major Exam: ";cin>>MajorExam;
        gotoxy(1,11);cout<<"Prelim Grade: ";
    }

int getgrade(double a, double b, double c, double d)
    {
        double result;
        result=(a*0.10)+(b*0.20)+(c*0.30)+(d*0.40);
        cout<<setprecision(1)<<result;
        return result;
    }
void outputgrade()
    {
        getgrade(AAO,Project,Quizzes,MajorExam);
        getch();
    }
void inputmidterm()
    {
        gotoxy(33,4);cout<<"Input Midterm Grade";
        gotoxy(29,6);cout<<"Attendance/Ass./Oral: ";cin>>AAO;
        gotoxy(29,7);cout<<"Project: ";cin>>Project;
        gotoxy(29,8);cout<<"Quizzes: ";cin>>Quizzes;
        gotoxy(29,9);cout<<"Major Exam: ";cin>>MajorExam;
        gotoxy(29,11);cout<<"Temporary Midterm Grade: ";
        gotoxy(29,12);cout<<"Final Midterm Grade: ";
    }
void outputgrade2()
    {
        getgrade(AAO,Project,Quizzes,MajorExam);
        getch();
    }


void main()
    {
    inputprelim();
    gotoxy(15,11);outputgrade();
    inputmidterm();
    gotoxy(54,11);outputgrade2();
    gotoxy(55,11);
    Midterm1=(outputgrade()*1/3)+(outputgrade2()*2/3);
    }

Answer 1

outputgrade()和outputgrade2()需要return一个numeric值用于计算。

现在他们return什么都没有。

Answer 2

您的函数 outputgrade() 和 outputgrade2() 属于 return 类型 void。为了在 midterm1=(outputgrade()*1/3)+(outputgrade2*2/3) 中使用它们，您需要将它们的 return 类型更改为 int/double/float，等等

如果我正确理解了您的代码逻辑，请将这两个函数编辑为：

double outputgrade()
    {
        return getgrade(AAO,Project,Quizzes,MajorExam);
    }

double outputgrade2()
{
    return getgrade(AAO,Project,Quizzes,MajorExam);
}

我所做的是将 return 类型更改为 double，同时这两个函数现在 returning 任意值 getgrade returns.

"Not an allowed type" 在 Turbo C++ 中

"Not an allowed type" in Turbo C++

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