Question

Do the following lab by while or Do-while loop.

question: Write a c++ program that asks students to enter 3 valid grades and then calculate the average and print it. if the user enters the invalid grade you should print the error message and get the new grade.

Hint1: each time your program ask the following question: "Do you want to calculate another average?" and if the answer to this question is "Y" or "y" then you should continue.

Hint2: this class at least has one student.

Answer 1

Hi this is the code,

//Consider highest grade is 10.taking grades out of 10.
#include <iostream>

using namespace std;

int main() {
    int i = 0,gr[3],grade,avg,sum;     //grade for acceptng each grade and gr is an array to store 3 grades.
    char ch;                           //for user choice(y/Y)
    do{
        i=0;
        sum=0;
        while(i<3){
            cout<<"Enter a grade(<=10):  ";       //asking for input from user.
            cin>>grade;
            if(grade<=10 && grade>0){              //check if its valid or not.
                gr[i]=grade;
                sum+=gr[i];                        //sum for adding the grades.
                i++;
            }else{
                cout<<"Not valid, please enter a valid grade.  "<<endl;      //error message.
            }
        }
        avg=sum/3;                                  //calculating the average.
        cout<<"Your average is:  "<<avg<<endl;
        cout<<"Do you want to calculate another average?  ";
        cin>>ch;                                     //again asking user for calculating average.
    }while (ch == 'y' or ch=='Y');                    //check if its yes.
    
    return 0;
}

Happy Coding.

PLEASE GIVE A THUMBS UP IF IT WAS HELPFUL AND LEAVE A COMMENT FOR ANY QUERY.

THANKS.