Question

(Statistics) a. Write a C++ program that reads a list of double-precision scores from the keyboard into an array named scores. It is assumed that the user will enter no more than 35 scores. The scores are to be counted as they're read, and entry is to be terminated when a negative value has been entered. After all scores have been input, your program should find and display the sum and average of the scores. The scores should then be listed with an asterisk (*) placed in front of each score that is below the average. b. Extend the program written in Exercise 1a to display each score and its letter equivalent, using the following scale: Between 90 and 100 = A Greater than or equal to 80 and less than 90 = Greater than or equal to 70 and less than 80 = Greater than or equal to 60 and less than 70 = Less than 60 = F

Answer 1

#include <iostream>

using namespace std;

int main(){

    int max = 35, count =0;

    double sum=0, average=0;

    //Declaring the array to store scores

    double marksArray[max];

    cout<<"Enter scores and any negative number to terminate"<<endl;

    //Getting the inputs from user

    //This loop will execute maximum of 35

    while(count<max){

        cin>>marksArray[count];

        //if the number is negative then loop is terminated

        if(marksArray[count]<0)

            break;

        sum = sum + marksArray[count];

        count++;

    }

    //Calculating the average

    average = sum/count;

    //Printing the scores with equivalent grade

    cout<<"Entered Scores:"<<endl;

    for(int i=0; i<count; i++){

            //if the score is below average

        if(marksArray[i]<average){

            if(marksArray[i]<=100 && marksArray[i]>=90){

                cout<<"*"<<marksArray[i]<<": A"<<endl;

            }

            else if(marksArray[i]<90 && marksArray[i]>=80){

                cout<<"*"<<marksArray[i]<<": B"<<endl;

            }

            else if(marksArray[i]<80 && marksArray[i]>=70){

                cout<<"*"<<marksArray[i]<<": C"<<endl;

            }

            else if(marksArray[i]<70 && marksArray[i]>=60){

                cout<<"*"<<marksArray[i]<<": D"<<endl;

            }

            else{

                cout<<"*"<<marksArray[i]<<": F"<<endl;

            }

        }

        //printing for scores above average

        else{

            if(marksArray[i]<=100 && marksArray[i]>=90){

                cout<<marksArray[i]<<": A"<<endl;

            }

            else if(marksArray[i]<90 && marksArray[i]>=80){

                cout<<marksArray[i]<<": B"<<endl;

            }

            else if(marksArray[i]<80 && marksArray[i]>=70){

                cout<<marksArray[i]<<": C"<<endl;

            }

            else if(marksArray[i]<70 && marksArray[i]>=60){

                cout<<marksArray[i]<<": D"<<endl;

            }

            else{

                cout<<marksArray[i]<<": F"<<endl;

            }

        }

    }

    cout<<"Total of the scores: "<<sum<<endl;

    cout<<"Average of the scores: "<<average<<endl;

    return 0;

}

Output:

C:\Users\devak\Documents\Untitled1.exe Enter scores and any negative number to terminate 100 100 90 100 100 10 99 Entered Scores: 100: A 100: A 89: B 190: A 100: A 100: A *e: F *10: F 99: A Total of the scores: 688 Average of the scores: 76.4444 Process returned © (@xo) Press any key to continue. execution time : 28.750 s