带浮点函数的C++错误4716

我用float函数很难用返回值。每次我尝试输入一个返回值时，我都会收到错误的未知值，或者您必须输入一个返回值。我很迷茫。带浮点函数的C++错误4716

这里是我的程序：

#include <iostream> 
#include <iomanip> 
#include <string> 

using namespace std; 

string studFirstName; 
string studLastName; 
float studExam1; 
float studExam2; 
float studExam3; 
float studScore; 
float studAvg; 

void getStudName(string& studFirstName, string& studLastName); 
void getStudExams(float& studExam1, float& studExam2, float& studExam3); 
float calStudAvg(float studExam1, float studExam2, float studExam3); 
void displayGrade(string studFirstName, string studLastName, float studavg); 

int main() 
{ 
    cout << "Enter Student's First Name:"; 
    cin >> studFirstName; 
    cout << endl; 

    cout << "Enter Student's Last Name:"; 
    cin >> studLastName; 
    cout << endl; 
} 

void getStudExams(float& studExam1, float& studExam2, float& studExam3) 
{  
    cout << "Enter score for Exam 1:"; 
    cin >> studExam1; 
    cout << endl; 

    cout << "Enter score for Exam 2:"; 
    cin >> studExam2; 
    cout << endl; 

    cout << "Enter score for Exam 3:"; 
    cin >> studExam3; 
    cout << endl; 
} 

float calStudAvg(float studExam1, float studExam2, float studExam3) 
{ 
    float studScore = (studExam1 + studExam2 + studExam3); 
    float studAvg = (studScore/3); 
    return; 
} 

void displayGrade(string studFirstName, string studLastName, float studAvg) 
{  
    cout << "Student's First Name:"; 
    getline (cin, studFirstName); 
    cout << endl; 

    cout << "Student's Last Name:"; 
    getline (cin, studLastName); 
    cout << endl; 

    cout << left << "Student's Final Grade:" 
    << right << studAvg << endl; 

    if (studAvg >= 90) 
     cout << "Grade = 'A'" << endl; 
    else if (studAvg >= 80) 
     cout << "Grade = 'B'" << endl; 
    else if (studAvg >= 70) 
     cout << "Grade = 'C'" << endl; 
    else if (studAvg >= 60) 
     cout << "Grade = 'D'" << endl; 
    else 
     cout << "Grade = 'F'" << endl; 

    system("pause"); 
}

，如果任何人有任何想法，我真的需要帮助！谢谢

来源

2014-11-04 Alyssa Delzell

return; ???你要么返回studScore或studAvg。 – Jagannath 2014-11-04 05:38:43

我试了两次，它给了我一个致命的错误。 – 2014-11-04 05:40:44

您抱怨编译错误。这解决了编译错误。您尚未显示您是如何调用该方法的。 – Jagannath 2014-11-04 05:45:28

float calStudAvg(float studExam1, float studExam2, float studExam3) 

{ 
float studScore = (studExam1 + studExam2 + studExam3); 

float studAvg = (studScore/3); 

return; 
}

简单地把返回在你的功能块不返回任何东西。你必须明确指定你希望该函数返回的值。像你的情况似乎你想要做的事，如： -

return studAvg ;

从空返

除了意味着编译器将控制返回给调用者，这意味着，你甚至可以在功能上，其返回使用空的返回类型为void 。

此外，从数学方面来说，确保您所采取的平均分数是用相同的数字计算出来的。否则，你必须使用加权平均。

来源

2014-11-04 05:45:05 ravi

我不知道怎么行事问题是你在哪里调用这些方法？无论如何，尝试这个，这将不会显示任何erros，也是你的代码系统（“暂停”）它很慢。它依赖于平台。这是不安全的。所以请使用任何方法

#include <iostream> 
#include <iomanip> 
#include <string> 

using namespace std; 

string studFirstName; 
string studLastName; 
float studExam1; 
float studExam2; 
float studExam3; 
float studScore; 
float studAvg; 

void getStudName(string& studFirstName, string& studLastName); 
void getStudExams(float& studExam1, float& studExam2, float& studExam3); 
float calStudAvg(float studExam1, float studExam2, float studExam3); 
void displayGrade(string studFirstName, string studLastName, float studavg); 

int main() 
{ 

cout << "Enter Student's First Name:"; 
cin >> studFirstName; 
cout << endl; 

cout << "Enter Student's Last Name:"; 
cin >> studLastName; 
cout << endl; 
} 

void getStudExams(float& studExam1, float& studExam2, float& studExam3) 

{ 

cout << "Enter score for Exam 1:"; 
cin >> studExam1; 
cout << endl; 

cout << "Enter score for Exam 2:"; 
cin >> studExam2; 
cout << endl; 

cout << "Enter score for Exam 3:"; 
cin >> studExam3; 
cout << endl; 
} 

float calStudAvg(float studExam1, float studExam2, float studExam3) 

{ 
float studScore = (studExam1 + studExam2 + studExam3); 

float studAvg = (studScore/3); 

return studAvg; 
} 

void displayGrade(string studFirstName, string studLastName, float studAvg) 

{ 
cout << "Student's First Name:"; 
getline (cin, studFirstName); 
cout << endl; 

cout << "Student's Last Name:"; 
getline (cin, studLastName); 
cout << endl; 

cout << left << "Student's Final Grade:" 
<< right << studAvg << endl; 

if (studAvg >= 90) 
    cout << "Grade = 'A'" << endl; 
else if (studAvg >= 80) 
    cout << "Grade = 'B'" << endl; 
else if (studAvg >= 70) 
    cout << "Grade = 'C'" << endl; 
else if (studAvg >= 60) 
    cout << "Grade = 'D'" << endl; 
else 
    cout << "Grade = 'F'" << endl; 

}

来源

2014-11-04 05:49:06

带浮点函数的C++错误4716

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