Question

Use an array (not in vectors we didn't learn that yet, just use regular arrays) to solve question 1. The code must be in C++

1a. Write a program to help me compute the average score on the quiz. Your program should prompt me to enter scores until I’m done (when I’m done I’ll enter -1). Then your program should print out the average.
1b. Build error handling into your code from 1a. If I enter a number that isn’t a valid score (the max possible is 30) or -1, reject the input and prompt me again for input. (Note: since you need to turn in both 1a and 1b, it would be easiest to start a new project and copy over your code from 1a)
1c. Modify your program from 1b so that, after I’m done entering scores, in addition to the average, it also prints out the highest and lowest scores in the class. (Note: It would be easiest to start a new project and copy over your code from 1b)

Answer 1

#include<iostream.h>
#include<conio.h>

int main()
{
//local variables
int total=0,highest=0,lowest=0,count=0;
int score=0;
float average=0;
clrscr(); //to clear screen
//condition loop untill you have not done
while(score!=-1)
{
cout << "Enter score(From 1 to 30) or -1 when you have done: ";
cin>>score;
if(score==-1) //quit when user enter -1
break;
if(score>30)
{
cout << "Please Enter valid score ";
cin>>score;
}
if(score<=30) //valid score calculation
{
count=count+1;
total=total+score;
   if(score>highest || highest==0)
   highest=score;
   if(score<lowest || lowest==0)
   lowest=score;
}

} //end while
//calculating average score
if(count!=0)
average=(total/count); //calculation of average in integer form

cout<<endl<<" Average score : "<<average; //printing average score
cout<<endl<<" Highest score : "<<highest; //printing highest score
cout<<endl<<" Lowest score : "<<lowest; //printing lowest score

}