#include <iostream.h>
#include <string.h>


//function declarations!
char perc_2_grade(int);
//could have been
//void perc_2_grade(int);
void grade_2_perc(char);

void main()
{
	int a;
	char b;
	do
	{
		cout << "\nPlease enter an integer from 0-100: ";
		cin >> a;
		cout << "\nPlease enter a character: ";
		cin >> b;
		//b = toupper(b);
	}while (a<0 || a>100 || b<'A' || b>'F');
	char res = perc_2_grade(a);					//function call
	cout << "\nYour grade is: " << res << endl;
	grade_2_perc(b);							//function call
	return;
}

char perc_2_grade(int x)
{
	if (x>=80)
		return 'A';
	else if (x>=70)
		return 'B';
	else if (x>=60)
		return 'C';
	else if (x>=50)
		return 'D';
	else
		return 'F';
}

void grade_2_perc(char x)
{
	switch(x){
	case 'A': cout << "\nYour percentage is between 80-100!" << endl;
		break;
	case 'B': cout << "\nYour percentage is between 70-79!" << endl;
		break;
	case 'C': cout << "\nYour percentage is between 60-69!" << endl;
		break;
	case 'D': cout << "\nYour percentage is between 50-59!" << endl;
		break;
	case 'F': cout << "\nYour percentage is between 0-49!" << endl;
		break;
	default: cout << "\nInvalid Grade!" << endl;
	}
}