Problem Create a program that determines grades at the end of the semester. Spec

Question

Problem

Create a program that determines grades at the end of the semester.

Specifications

Using the array class, construct a 5 x 7 two-dimensional array based on the following table

Calculate the average for each student and store it in the Ave column.

Calculate the weighted average for each student (the first grade gets a weight of .2, the second a weight of .3, the third a weight of .3, and the fourth a weight of .2) and store it in the Wt Ave column.

HINT: Use a loop: for each row, calculate the ave and weighted average and store the values in the appropriate column.

Output the contents of the entire array neatly formatted in columns and rows with appropriate row and column labels.

Student Grade 1 Grade 2 Grade 3 Grade 4 Ave Wt Ave 1 85 88 90 81 2 73 68 75 77 3 94 89 82 91 4 88 79 81 84 5 71 65 78 73

Explanation / Answer

PROGRAM IN C++

#include<iostream>

#include<iomanip>

using namespace std;

int main()

{

float arr[5][7]; // Declare float two dimensional array

// Declare variables

int sum;

float avg;

float grade;

cout<<" Read Student Marks ";

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

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

cin>>arr[i][j]; // Read Marks of the each students

for(int i=0;i<5;i++) {

sum=0; // initialize sum=0

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

sum+=arr[i][j]; // calculate sum of an array of marks

avg=(float)sum/5.0; //calculate average marks

  

arr[i][5]=(float)avg; // store average marks into 6th column

// check all conditions finding grade

if(avg>=90&&avg<=100)

grade=.2;

else

if(avg>=70&&avg<90)

grade=.3;

else

if(avg>=60&&avg<50)

grade=.3;

else

grade=.2;

cout<<setprecision(2);

arr[i][6]=(float)grade; // store grade marks into 7th column

}

}

// Display 5x7 table following including grades and average and weighted average marks

cout<<endl<<endl;

cout<<"============================================================ ";

cout<<"Student"<<" "<<"Grade1"<<" "<<"Grade2"<<" "<<"Grade3"<<" "<<"Grade4"<<" "<<"Ave"<<" "<<"Wt Ave"<<endl;

cout<<"============================================================ ";

for(int i=0;i<5;i++){

for(int j=0;j<7;j++){

cout<<arr[i][j]<<" ";

}

cout<<endl;

}

cout<<"============================================================ ";

return 0;

}

OUTPUT

Read Student Marks
1 85 88 91 81
2 73 68 75 77
3 94 89 82 91
4 88 79 81 84
5 71 65 78 73

============================================================
Student Grade1 Grade2 Grade3 Grade4 Ave Wt Ave
============================================================
1 85 88 91 81 69 0.2
2 73 68 75 77 59 0.2
3 94 89 82 91 72 0.3
4 88 79 81 84 67 0.2
5 71 65 78 73 58 0.2
============================================================

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