Question

Using three arrays: a one-dimensional array to store the students’ names, a (parallel) two-dimensional array to store the test scores, and a parallel one-dimensional array to store grades. Your program must contain at least the following functions: a function called GetData to read and store data into two arrays, a function called Average that is used to calculate the average test score and grade, and a function called PrintResults to output the results. The student names should be to the left with a width of 10 columns. The test scores should be to the right with a width of 5 columns. Have your program also output the class average on a line after the output.

3 serperate arrays should be used
and it should read from a file
ive used some void functions two dimensional arrays to read numbers from a text file but im getting a lot of errors i know setw needs to be used also

Answer 1

This C++ program considers scores as follows

A>=90

B>=80

C>=70

D>=60

F<60

You must have a text file for input data

Here is the program as per the question

#include<iostream>

#include<fstream>

#include<string>

#include<stdlib.h>

using namespace std;

//Definition

class student

{

private:

string names[80];

int testscores[80][50];

char grades[80];

int count;

public:

void GetData();

void Average();

void PrintResult();

};

void student::GetData()

{

ifstream in;

in.open("student1.txt",ios::in);

if(in.fail()) //test if the file exist

{

cout<<"Unable to open the file";

exit(0);

}

count=0;

while(!in.eof())

{

in>>names[count]; //read name

for(int i=0;i<5;i++) // assume 5there are 5 test scores

{

in>>testscores[count][i]; //read scores .

}

count++;

}

count--;

}

void student::Average()

{

float sum,avg;

for(int i=0;i<count;i++)

{

sum=0.00;

for(int j=0;j<5;j++)

{

sum=sum+testscores[i][j];

}

avg=sum/5;

if(avg>=90.00)

grades[i]='A';

else if(avg>=80)

grades[i]='B';

else if(avg>=70)

grades[i]='C';

else if(avg>=60)

grades[i]='D';

else

grades[i]='F';

}

}

void student::PrintResult()

{

for(int i=0;i<count;i++)

{

cout.setf(ios::left,ios::adjustfield);

cout.width(10);

cout<<endl<<names[i];

cout.setf(ios::right,ios::adjustfield);

for(int j=0;j<5;j++)

{

cout.width(5);

cout<<testscores[i][j];

}

cout.width(5);

cout<<grades[i];

}

}

int main()

{

student obj;

obj.GetData();

obj.Average();

obj.PrintResult();

return 0;

}