Question

Write a C++ program. Using the while loop or the do – while loop write a program that does the following:

Calculate the average of a series of homework grades (0 - 100) entered one at a time.

In this case the lowest score will be dropped and the average computed with the remaining grades. For example suppose you enter the following grades: 78, 85, 81, 90, 88, 93 and 97.The average will be computed from the 6 grades 85, 81, 90, 88, 93 and 97. The low score of 78 will be dropped.

Output each grade, the dropped grade and the final average.

Answer 1

Program:

#include<iostream>
using namespace std;

int main()
{
int grade,length;
cout<<"How many grades do you want: ";
cin>>length;

int grades[length];

int i=0;
while(i<length)
{
cout<<"Enter Grade "<<(i+1)<<": ";
cin>>grade;
while(1)
{
if(grade>=0 && grade<=100)
{
break;
}
else
{
cout<<"Please Enter Grade (0-100)"<<(i+1)<<": ";
cin>>grade;
}
}
grades[i]=grade;
i++;
}

i=0;
int min=grades[0];

while(i<length)
{
if(min>grades[i])
{
min=grades[i]; //get lowest grade
}
i++;
}

i=0;
int c=0,sum=0;

while(i<length)
{
if(grades[i]!=min)
{
sum=sum+grades[i]; //sum of all grades except lowest grade
c++;
}
i++;
}

double average=(double) sum/c; //calculating the average

cout<<"\n\nGrades with the dropped grade: ";
i=0;
while(i<length)
{
cout<<grades[i]<<" ";
i++;   
}

cout<<"\n\nGrades without the dropped grade: ";
i=0;
while(i<length)
{
if(grades[i]!=min)
{
  
cout<<grades[i]<<" ";
}
i++;   
}
cout<<"\n\nThe dropped grade: "<<min<<endl;
cout<<"\nThe final average: "<<average<<endl;

}

Output: