Thread: how to make functions?

speedy 5 your suggestion of use the switch statement was great. thank you
i hadn't thought about it because it hasn't been tought in my class yet.
as for EOF it means end of file and exits the program.
now i got mostly everything down i still have one problem
im suppose to prompt an error message when the user doesnt give a interger when asking for the height, width, side ....etc...
what should i use?
and when i enter things other than intergers the program would just keep looping forever.
one sample output i need is when the use enters triangle and gets an error message and is prompt again
enter again. what do i need for it statement do i need for it to do that and stop looping?
thanks a million
clear

Code:

#include <stdio.h>
#define PI 3.14

void main (){
	
	int chose = 0;
	int rwidth = 0;
	int rheight = 0;
	int rarea = 0;
	int rperi = 0;
	int side = 0;
	int sarea = 0;
	int speri = 0;
	int radius = 0;
	double carea = 0;
	double cperi = 0;
	int base =0;
	int rside = 0;
	int lside = 0;
	int tarea = 0;
	int tperi =0;
	int theight = 0;
	

	printf("Please choose 1-5 to calculate\n");
	printf("the area and perimeter/circumference\n"); 
	printf("of the various geometric shapes.\n");
	do {
	printf("1. Rectangle\n");
	printf("2. Square\n");
	printf("3. Circle\n");
	printf("4. Triangle\n");
	printf("5. Exit (or EOF, Control+Z)\n");

	printf("Enter a value between 1 and 5: ");

		scanf("%d", &chose);

		switch (chose)
		{
		case (1) :	printf("Please enter the width: ");
					scanf("%d", &rwidth);
					printf("Please enter the height: ");
					scanf("%d",&rheight);
		
					rarea = rwidth * rheight;
					rperi = 2 * (rwidth * rheight);
	
					printf("The area of the rectangle is %d.\n", rarea);
					printf("The perimeter of the rectangle is %d.\n", rperi);
					break;
		case (2) :  printf("Please enter the side: ");
					scanf("%d", &side);
						
					sarea = side * 4;
					speri = (side * side);
			
					printf("The area of the square is %d.\n", sarea);
					printf("The perimeter of the square is %d.\n", speri);
					break;
		case (3) :  printf("Please enter the radius: ");
					scanf("%d", &radius);
				
					carea = PI * radius * radius;
					cperi = 2 * PI * radius;

					printf("The area of the cirlce is %.2f.\n", carea);
					printf("The circumference of the circle is %.2f.\n", cperi);
					break;
		case (4) :	printf("Please enter the base: ");
					scanf("%d",&base);
					printf("Pleare enter the left side: ");
					scanf("%d", &lside);
					printf("Please enter the right side: ");
					scanf("%d",&rside);
					printf("Please enter the height: ");
					scanf("%d", &theight);

					tperi = base + lside + rside;
					tarea = (base * theight) / 2;

					printf("The area of the triangle is %d.\n", tarea);
					printf("The perimeter of the triangle is %d.\n", tperi);
					break;
		case (5) : EOF;
			break;

		default :	printf("Invalid choice entered.\n");
					printf("Please enter a value between 1 and 5\n");
					break;
					}
		}
		while (chose != 5);

}

clear: Post with code tags please. You can use the "edit" button to amend your previous posts to make your code readable.

>>as for EOF it means end of file and exits the program.

Not true, EOF is a Symbolic Integer Constant used to compare things to, not exit the program. If you wanted to do that you will want to use exit(0); with the stdlib.h header file. EOF will do nothing in this state. Its almost like putting -1; in the middle of your code. It just does nothing.

--edit--

What do you want the program to do if the user does enter some odd character instead of 1-5. Ask for another input like if you entered 7?