Thread: Creating a menu system

How would I do this:

Menu option 1:
Menu option 2:
Menu option 3:
Menu option 4: Exits menu system

Then the user selects one of the options by entering a number 1 to 3
and the menu system needs to return the user to the menu . The only way I see is to use gotos , but as there is almost never a reason yo use gotos , I know there is a better way .

Originally Posted by zacs7

Something like:

Code:

int ch;
ch = getchar();

switch(ch)
{
    case '1':
        /* option 1 */
    break;

    case '2':
        /* option 2 */
    break;

    case '3':
        /* option 3 */
    break;

    case '4':
        /* exit */
    break;
}

So the break; quits out of the loop , and returns to the beginning of the loop ? I thought it just quits the program

What I mean is will the menu system loop in the above example if 1-3 is selected ?

Thank you zacs7

This is what I came up with in pseudo , I'm not sure if exit is correct to use to break out of the loop .

Code:

While Looping=1 // While Loop, Used to loop the menu system
	{	Input Choice	// The Choice variable will be used to select from one of the following menu options
		If Choice='?'
		Then 
		{
			Output " This is the help menu 
        		Enter ? for help , q to quit at the main menu . 
         		This program will calculate the exposure value for the entered :
         		Aperture , ISO and shutter speed . Press <Enter key> to continue,"
			Looping<--1
			exit
		}
	Else if Choice=’1’
	Then 
		{
			Output “Please enter your name”
			Input Name
			exit
		}
	Else if Choice='2'
	Then
		{
			output name," Please enter the ISO value "
			Input ISO
			For (i=0;len(ISO_VALID);i++)
				If ISO==ISO_VALID[i]);  // Do strcmp() in C
				Then
				{
						Output "You have entered an allowed value"
						Looping<--1
						exit
					}
		}
	Else
		{
			Output "You have entered an invalid ISO value"
			Looping<--1
			exit
		}

	Else if Choice='4'
	Then
		{
			Output "Please enter an aperture value"
			Input guess
			Looping<--1
			exit
		}
	Else if Choice='5'
	Then
		{
			Looping<--0
		}
}

DoWhile

If its pseudocode you only need if, then, else. u cant include the " { "s but its past the due date already...

Your pesudo code more speaks about the If-else-if statment which is something more smilar to switch statment. In that case when you say exit it means two thing 1. You are exiting from the switch 2. your exiting from thr whole program.

So i would sugguest to use break instead of exit, if your main intention was to use switch. Which basically means that your exiting from your while loop.

ssharish