Question

This is my code for a final GPA calculator. For this assignment, I'm not supposed to use global variables.

My question is: does my code contain a global variable/ global function, and if so how can I re-write it to not contain one?

/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
* Title: Final GPA Calculator
* Course Computational Problem Solving CPET-121
* Developer: Elliot Tindall
* Date: Feb 3, 2020
* Description: This code takes grades that are input by the student and displays
* their final average based on those grades
*/+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

#include<iomanip>
#include <iostream>
using namespace std;
double average(double a[], int n)
{
// Find sum of array element
double sum = 0;
for (int i=0; i<n; i++)
sum += a[i];
return sum/n;
}
double round(double var)
{
// 37.66666 * 100 =3766.66
// 3766.66 + .5 =3767.16 for rounding off value
// then type cast to int so value is 3767
// then divided by 100 so the value converted into 37.67
double value = (int)(var * 100 + .5);
return (double)value / 100;
}
int main()
{
double homeworkAssignments[8];
double laboratoryAssignments[4];
double midTerm;
double finalExam;
char termPaperGrade;
bool classParticipation;
const double HwAssignWeightage = 15,LabAssignWeightage =20,midTermWeightage =25,finalExamWeightage =25,termPaperGradeWeightage =10,classParticipationWeightage= 5;
for(int i = 0;i<8;i++)
{
cout<<"Enter homework assignment "<<i+1<<" points (out of 10):";
cin>>homeworkAssignments[i];
}
for(int i = 0;i<4;i++)
{
cout<<"Enter laboratory assignment "<<i+1<<" points (out of 50):";
cin>>laboratoryAssignments[i];
}
cout<<"Enter mid term points (out of 100):";
cin>>midTerm;
cout<<"Enter final exam points (out of 100):";
cin>>finalExam;
cout<<"Enter term paper letter grade:";
cin>>termPaperGrade;
cout<<"Enter class participation( 0 or 1):";
cin>>classParticipation;

double averageHwAssignments = average(homeworkAssignments,8)*10;
double averageLabAssignments = (average(laboratoryAssignments,4)/50)*100;

double finalExamAverage = (finalExam/100)*100;
double midTermAverage = (midTerm/100)*100;

double termPaperGradeAverage;
switch(termPaperGrade)
{
case 'A':
case 'a':
termPaperGradeAverage=95;
break;
case 'B':
case 'b':
termPaperGradeAverage=85;
break;
case 'C':
case 'c':
termPaperGradeAverage=75;
break;
case 'D':
case 'd':
termPaperGradeAverage=65;
break;
case 'F':
case 'f':
termPaperGradeAverage=55;
break;
default:
termPaperGradeAverage=0;
}

double classParticipationAverage = classParticipation*100;

double finalAverage = (HwAssignWeightage/100)*averageHwAssignments + (LabAssignWeightage/100)*averageLabAssignments +
(midTermWeightage/100)*midTermAverage + (finalExamWeightage/100)*finalExamAverage +
(termPaperGradeWeightage/100)*termPaperGradeAverage + (classParticipationWeightage/100)*classParticipationAverage;

cout<<"Homework Average........... :"<<setw(15)<<round(averageHwAssignments)<<endl;
cout<<"Laboratory Average......... :"<<setw(15)<<round(averageLabAssignments)<<endl;
cout<<"Midterm Exam............... :"<<setw(15)<<round(midTermAverage)<<endl;
cout<<"Final Exam................. :"<<setw(15)<<round(finalExamAverage)<<endl;
cout<<"Term Paper................. :"<<setw(15)<<termPaperGradeAverage<<"["<<termPaperGrade<<"]"<<endl;
cout<<"Class Participation........ :"<<setw(15)<<classParticipationAverage<<endl<<endl;

cout<<"Final Average.............. :"<<setw(15)<<round(finalAverage)<<endl;
string LetterGrade;
if(finalAverage>=93){
LetterGrade = "A";
}
else if(finalAverage>=90 && finalAverage <= 92.9)
{
LetterGrade = "A-";
}
else if(finalAverage>=87 && finalAverage <= 89.9)
{
LetterGrade = "B+";
}
else if(finalAverage>=83 && finalAverage <= 86.9)
{
LetterGrade = "B";
}else if(finalAverage>=80 && finalAverage <= 82.9)
{
LetterGrade = "B-";
}else if(finalAverage>=77 && finalAverage <= 79.9)
{
LetterGrade = "C+";
}else if(finalAverage>=73 && finalAverage <= 76.9)
{
LetterGrade = "C";
}else if(finalAverage>=70 && finalAverage <= 72.9)
{
LetterGrade = "C-";
}else if(finalAverage>=60 && finalAverage <= 69.9)
{
LetterGrade = "D";
}else{
LetterGrade = "F";
}
cout<<"Course Letter Grade........ :"<<setw(15)<<LetterGrade<<endl;

if(LetterGrade=="C-"||LetterGrade=="D"){
cout<<"Please see your Academic Advisor";
}
else if(LetterGrade=="F"){
cout<<"Sorry You need to repeat the course";
}
return(0);
}

Answer 1

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A global variable is the one way that is declared outside of the main method and not inside any other method. IT is clear that you haven't used any global variables in your code.