#include<iostream.h>

void area_square(void);
void area_triangle(void);
void area_rectangle(void);
void area_circle(void);
void area_rhombus(void);

void main(void)
{
	int choice;

	cout <<"select numbers 1-5 to find the are of :" << endl;
	cout <<"1 square" << endl;
	cout <<"2 triangle" << endl;
	cout <<"3 rectangle" << endl;
	cout <<"4 circle" << endl;
	cout <<"5 rhombus\n\n\n" << endl;

	cout <<"Enter your choice :";
	cin >> choice;

	if (choice == 1)
	
		area_square();
	
	else if (choice == 2)
	
		area_triangle();
	
	else if (choice == 3)
	
		area_rectangle();
		
	else if (choice == 4)
	
		area_circle();
	
	else if (choice == 5)
	
		area_rhombus();
	
	else
		cout << "Incorrect choice" << endl;
}
void area_square(void)
{
	float side, result;
	cout <<"Enter the side of the square :";
	cin >> side;
	result = side * side;
	cout <<"area :" << result << endl;
}
void area_triangle(void)
{
	float base, height, result;
	cout <<"Enter the base of the triangle :";
	cin >> base;
	cout <<"Enter the height of the triangle :";
	cin >> height;
	result =.5 * base * height;
	cout <<"area :" << result << endl;
}
void area_rectangle(void)
{
	float width, height, result;
	cout <<"Enter the width of the rectangle :";
	cin >> width;
	cout <<"Enter the height of the rectangle :";
	cin >> height;
	result = width * height;
	cout <<"area :" << result << endl;
}
void area_circle(void)
{
	float radius, result;
	cout <<"Enter the radius of the circle :";
	cin >> radius;
	result = 3.141592654 * radius * radius;
	cout <<"area :" << result << endl;
}
void area_rhombus(void)
{
	float base, height, result;
	cout <<"Enter the base of the rhombus :";
	cin >> base;
	cout <<"Enter the height of the rhombus :";
	cin >> height;
	result = base * height;
	cout <<"area :" << result << endl;
}