I am running it with Microsoft Visual C plus plus 2010. Says that there is a bui

Question

I am running it with Microsoft Visual C plus plus 2010. Says that there is a build error.

#include <iostream>
using namespace std;
class record //contains values that are recorded
{
private:
double quiz1;
double quiz2;
double midyear, midyear_one;
double final, final_one;
double quiz_average;
char final_grade;
double total_grade;

public: void instructions()
{
cout << "Welcome to the program student record";
cout << endl << "this program takes in 2quizes, a final and midyear";
cout << endl << "and then calculates the average by what they are worth by";
cout << endl << "the quizes together are worth 25% and midyear counts for 25%";
cout << endl << "and the final counts for 50%"; cout << endl;
}

void input(record& the_grades)
{
cout << endl; cout << "Enter quiz 1 grade out of 10 points: ";
cin >> the_grades.quiz1; // gets value for quiz 1

while(the_grades.quiz1 > 10)
{
cout << "ERROR!: Invalid Value"; // Error check loop for quiz 1 and does not allow value for over 10 points
cout << endl;
cout << "Re- Enter Value for quiz 1: ";
cin >> the_grades.quiz1;// re-entered value for quiz 1
cout << endl;
}
cout << endl;
cout << "Enter quiz 2 grade out of 10 points: ";
cin >> the_grades.quiz2; // gets value for quiz 2

while(the_grades.quiz2 > 10) // Error check loop for quiz 2 and does not allow value for over 10 points
{
cout << "ERROR!: Invalid Value";
cout << endl;
cout << "Re- Enter Value for quiz 2: ";
cin >> the_grades.quiz2;// re-entered value for quiz 2 cout << endl;
}
cout << "Enter midyear Exam grade out of 100 points: ";
cin >> the_grades.midyear; // gets value for midyear exam

while(the_grades.midyear > 100) // Error check loop for midyear exam and does not allow value for over 100 points
{
cout << "ERROR!: Invalid Value";
cout << endl;
cout << "Re- Enter Value for Midyear Exam: ";
cin >> the_grades.midyear; // re entered value for midyear exam
cout << endl;
}
cout << endl;
cout << "Enter Final Exam grade out of 100 points: ";
cin >> the_grades.final; //gets value for final exam

while(the_grades.final > 100) // Error check loop for Final exam and does not allow value for over 100 points
{
cout << "ERROR!: Invalid Value";
cout << endl;
cout << "Re- Enter Value for Final Exam: ";
cin >> the_grades.final;// re-entered value for final exam
cout << endl;
}
cout << endl;
}

void output(record& the_grades)
{
the_grades.quiz_average = (((the_grades.quiz1/10) + (the_grades.quiz2/10))/2) * .25;
the_grades.final_one = (the_grades.final/100) * .5;
the_grades.midyear_one = (the_grades.midyear/100) *.25;
the_grades.total_grade = (the_grades.quiz_average + the_grades.final_one + the_grades.midyear_one) * 100;
cout << endl << endl;
cout <<"Quiz1: "<< (the_grades.quiz1/10)* 100 <<"% "; //displays quiz one percentage
cout << endl;
cout <<"Quiz2: "<< (the_grades.quiz2/10) * 100 <<"% ";//displays quiz two percentage
cout << endl;
cout <<"Midyear exam: " << the_grades.midyear<<"/100"; // displays midyear exam percentage
cout << endl;
cout <<"Final exam: " << the_grades.final<<"/100"; // displays final exam percentage
cout << endl;
cout <<"Final grade: "<< the_grades.total_grade <<" %"; // displays the final grade in percentage
cout << endl;
cout <<"Letter grade: ";

if(the_grades.total_grade <= 60.0) // if statesments to check which letter grade is recieved
{
cout << "F";
}

if((the_grades.total_grade >= 60.0)&&(the_grades.total_grade < 70.0))
{
cout << "D";
}

if((the_grades.total_grade >= 70.0)&&(the_grades.total_grade < 80.0))
{
cout << "C";
}

if((the_grades.total_grade >= 80.0)&&(the_grades.total_grade < 90.0))
{
cout << "B";
}

if(the_grades.total_grade >= 90.0)
{
cout << "A";
}
cout << endl;
}
};

int main()
{
char run_again; // variable to allow user to run program again record grades;
grades.instructions();// outputs instructions

do
{
grades.input(grades); // gets grades
grades.output(grades);// outputs the values
cout << endl << endl;
cout << "Run again?:";// asks user if the user wants to run again
cout << "(enter Y or N)";
cout << endl;
cin >> run_again;// if y then the program will run again
}

while((run_again == 'y')||(run_again == 'Y'));
cout << "";
cout << endl << endl;
system("pause");

return 0;
}

Explanation / Answer

there is 1 warning and 1 error in your code. Warning: write the definition of input() function outside the class don't try to make it inline function. Error: you didn't create the object of your class......i.e you are trying to access the instance function with the help of undefined object...in your case it is "grades.instructions()".

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