#include <iostream>
#include <cmath>
using namespace std;

//This is lab 3.
//These are to be called upon when typed under the main.

//These are the function declarations.
void hello(int); //This is part 1 of C.

void cube(int&); //This is part 2 of C.

double square_root(int); //This is part 3 of C.

char grade(double); //This is part 4 of C.

bool passed(char); //This is part 5 of C.

void goodbye(); // This is part 6 of C


int main ()
{	int no_lines=5, num;
	double num2, score;
	char q;
	

//Part 1.C

	hello( no_lines); //A call to the function Hello.

//Part 2.C

	cout << "Please enter a number. This number will be cubed.\n";
	cin >> num;
	cube(num); //Tell the cpu to refer to num formula.
	cout << num <<endl; //A call to the function to cube the number given.

//Part 3.C

	do //Do -While Function
	{
		cout << "Please enter a positive integer. This number will be square rooted.\n";
		cin >> num2;
		if (num2 !=0)
		
		if (num2 == 0 || num2 <=0)
		cout << "IS WRONG TRY AGAIN Please enter a number greater than zero ONLY!.\n";

	}while (num2 <= 0);

	square_root(num2); //Tells the cpu to square root the cin entered by the user.
	cout << sqrt(num2) <<endl; //A call to the function to sqaure root a number.
		
	cout << endl;

	//Part4.C

	do //Do -While Function
	{
		cout <<"Please enter the grade of your last exam range is 1-100.\n";
		cin >> score;
	}while (score < 0 || score >100);	
	
	cout << "Then your grade for that exam was an/a:" << endl;
	cout << grade(score) << endl; //A call to thw score function after a value has been entered and a grade will ge given.
		

//Part5.C

	q = grade(score);
	cout << "This is the grade you have received:\n";//Sentence stating the grade user got.
	cout << grade(score) <<endl; //Returns the grade that the user has received.
	cout << q << endl;
	cout << "If the number returned is 0 you FAILED. If it is 1, then you PASSED!. Congrats.\n";
	cout << passed(q)<< endl;

//Part6.C

	goodbye(); //This calls the function goodbye() and refers it out to the screen.

//Lab 3 completed.
return 0;

}


//These are the function definitions:
//Part 1 of C.
void hello(int no_lines)
{
	for(int i=0; i<no_lines; i++)
		cout << "Hello" << endl;
}
//Part 2 of C.
void cube(int& num)
{
	num=num*num*num;
}
//Part 3 of C.
double square_root(int num2)
{
	return sqrt(static_cast<double>(num2));
	cout << sqrt(num2) <<endl;
} 
//Part 4 of C.
char grade(double score)
{
	if (score >= 90) return 'A';
	else if (score >= 80) return 'B';
	else if (score >= 70) return 'C';
	else if (score >= 60) return 'D';
	return 'F';
}
//Part 5 of C.
bool passed(char grade)
{
	if ((grade=='A') | (grade=='B') | (grade =='C'))
		return true;
	return false;

}
void goodbye()
{
	cout << "Goodbye now!" << endl;
}
//This is the end of the function definitions