Answer to Question #296583 in C++ for se7le

Question

Write a C++ program that stores the grades of N students in an array of size 100. The

user must input at the beginning of the program the number of students N., then the

user must input the grade for each student. The program then must display the

following menu (use functions):

1. Print the minimum and maximum grade. (10 points)

2. Print the number of passing and failing students. (10 points)

3. Print the average grade, the percentage of passing students (grade >=70), and

the percentage of students that got a grade greater or equal to the average

grade. (15 points)

4. Exit. (5 points)

Answer 1

#include <iostream>






using namespace std;
int main(){
	int choice;
	int N;
	int grades[100];
	cout<<"Enter the number of students N: ";
	cin>>N;
	for(int i=0;i<N;i++){
		cout<<"Ente the grade for the student "<<(i+1)<<": ";
		cin>>grades[i];
	}


	do{
		cout<<"1. Print the minimum and maximum grade.\n";
		cout<<"2. Print the number of passing and failing students.\n";
		cout<<"3. Print the average grade, the percentage of passing students (grade >=70), and\n";
		cout<<"the percentage of students that got a grade greater or equal to the average grade.\n";
		cout<<"4. Exit.\n";
		cout<<"Your choice: ";
		cin>>choice;
		if(choice==1){
			int minimuGrade=grades[0];
			int maximumGrade=grades[0];
			for(int i=0;i<N;i++){
				if(grades[i]<minimuGrade){
					minimuGrade=grades[i];
				}
				if(grades[i]>maximumGrade){
					maximumGrade=grades[i];
				}
			}
			cout<<"The minimum grade: "<<minimuGrade<<"\n";
			cout<<"The maximum grade: "<<maximumGrade<<"\n";
		}else if(choice==2){
			int numberPassing=0;
			int numberFailing=0;
			for(int i=0;i<N;i++){
				if(grades[i]>=70){
					numberPassing++;
				}else{
					numberFailing++;
				}
			}
			cout<<"The number of passing students: "<<numberPassing<<"\n";
			cout<<"The number of failing students: "<<numberFailing<<"\n";


		}else if(choice==3){
			float averageGrade;
			float sum=0;
			float percentagePassingStudents;
			float percentageAverageStudents;
			int numberPassing=0;


			for(int i=0;i<N;i++){
				if(grades[i]>=70){
					numberPassing++;
				}
				sum+=grades[i];
			}
			averageGrade=sum/(float)N;
			percentagePassingStudents=(((float)numberPassing)/(float)N)*100.0;


			int studentGradeGreaterEqualAverageGrade=0;
			for(int i=0;i<N;i++){
				if(grades[i]>=averageGrade){
					studentGradeGreaterEqualAverageGrade++;
				}
			}
			percentageAverageStudents=(((float)studentGradeGreaterEqualAverageGrade)/(float)N)*100.0;
			cout<<"The average grade the students: "<<averageGrade<<"\n";
			cout<<"The percentage of passing students (grade >=70): "<<percentagePassingStudents<<"\n";
			cout<<"The percentage of students that got a grade greater or equal to the average grade: "<<percentageAverageStudents<<"\n";
		}else if(choice==4){
			//exit
		}else{
			cout<<"Wrong menu item\n\n";
		}
		cout<<"\n\n";
	}while(choice!=4);


	system("pause");
	return 0;
}