尝试将变量值分配给结构元素。起初变量有正确的值，但结构元素有垃圾值

Question

//Program tracks 10 students
//Prompts for first and last names
//Collect 4 grades from each student: final exam, 2 quizzes, and class project
//Report will display names w/ individual scores, class average, and highest grade

//Each students individual grade will be calculated with grade weights
/*Grade Weights
-2 Quizzes @ 15% each
-1 Final Exam @ 20% 
-1 Class Project @ 50% 
*/

#include<iostream>
using namespace std;

int main()
{
    struct goodStudent
    { 
        string fname;
        string lname;
        double exam;
        double quiz1;
        double quiz2;
        double project;
        float realgrd;      //(sum of ALL grade weights
    };

    int pupil = 10;                 //represents # of students in class
    goodStudent student[pupil];     //value of 'pupil' subs as value used to define #elements of student[]

    //******Prompt for Student Names:
    int i;

    for (i = 0; i < pupil; i++)
    {
        cout << "\n Student " << i+1 << " First Name:  ";
        cin >>student[i].fname;

        cout << "\t Student " << i+1 << " Last Name:  ";
        cin >>student[i].lname;
    }

    cout <<"--------------------------------";

    //*****Grade Collection and Weights Prompt
    int grade;
    double quizweight,examweight,projweight,cuml;


    for (grade = 0; grade < pupil; grade++)
    {
        cout <<"\n \t Student"<<" "<< grade+1; 
        cout << "\n Enter Quiz Grade 1: \n"; 
        cin >>student[grade].quiz1;

        cout <<"\n Enter Quiz 2 Grade:\n ";
        cin >>student[grade].quiz2; 
        quizweight = ((student[grade].quiz1)+(student[grade].quiz2))*.30;

        cout <<"\n Enter Final Exam Grade:\n ";
        cin >> student[grade].exam;
        examweight =(student[grade].exam)*.20;

        cout <<"\n Enter Project Grade:\n ";
        cin >>student[grade].project;
        projweight =(student[grade].project)*.50;

        //MATH GETS JUMBLED UP HERE.IDK had to do ALOT of conversion and revisions.... ;(
        cuml = ((projweight)+(examweight)+(quizweight));

        double adjust=((cuml/130))*100;//130 is max pts student can earn across all assignments
        cout<<adjust;
        adjust=student[grade].realgrd;

        cout<<"\n\n\n"<<student[grade].realgrd;
        /*
        FOR SOME REASON PROGRAM DOESN'T LIKE PUTTING ASSIGNED VALUES INTO ARRAY STRUCT..
        fix=student[grade].realgrd;

        cout<<"\n\nLet's Try it AGAIN:  "<<student[grade].realgrd;

        cout<<"\nGrade For Student "<<grade+1<<"\tIs A: "<<fix;
        */
        system("PAUSE");
    }
}

好的。所以我试图为结构数组中的元素赋值。在将值分配给数组中的元素之前，我打印了该值。这是我想要的值，但是当我打印数组以检查是否存在相同的值时，它是一个很长的垃圾数字，如 7.6674323e-309。我什至将结构成员 "realgrd" 更改为 double、float 和 long 变量类型，看看是否会改变输出，但这不起作用。

Answer 1

我认为你把这条线倒过来了

 adjust=student[grade].realgrd;

你是说

student[grade].realgrd = adjust;

尝试将变量值分配给结构元素。起初变量有正确的值，但结构元素有垃圾值

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