Basic C menu

This is a discussion on Basic C menu within the C Programming forums, part of the General Programming Boards category; Hi im kinda new to C and im learning from a teach yourself c book, but i dont really understand ...

  1. #1
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    Question Basic C menu

    Hi im kinda new to C and im learning from a teach yourself c book, but i dont really understand how to make a basic menu. Basically i want to make a program which can display all of my little programs which i have been working on throughout the book. I would be grateful if you could give me a webpage or some code. I dont have any code, as i said earlier i have no idea what to do! Thanks for looking

    Smilk

  2. #2
    End Of Line Hammer's Avatar
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    You can do it kinda like this:

    -printf the options to the screen.
    -Get user input (normally a number)
    -Use a switch to branch to the relevant section of code.

    Try having a go at a few basics (like just printf'ing the menu to start with), the post your code here when you have problems.
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  3. #3
    Im a Capricorn vsriharsha's Avatar
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    Talking

    Try This...

    Code:
    #include<stdio.h>
    #include<conio.h>
    int main()
    {
    int choice=0;
    while(choice!=4)
    {
     clrscr();
     printf("\n\tMENU DEMONSTRATION");
     printf("\n\t------------------------------");
     printf("\n\n\t 1. OPTION 1");
     printf("\n\t 2. OPTION 2");
     printf("\n\t 3. OPTION 3");
     printf("\n\t 4. EXIT");
     printf("\n\n Enter Your CHoice: ");
     scanf("%1[1234]d%*c",&choice);
     switch(choice)
     {
      case 1:
                  printf("\nYOU SELECTED OPTION 1 %c",1);
                  break;
      case 2:
                  printf("\nYOU SELECTED OPTION 1 %c",2);
                  break;
      case 3:
                  printf("\nYOU SELECTED OPTION 1 %c",3);
                  break;
      case 4:
                  printf("\nYOU SELECTED OPTION 1 %c",4);
                  exit(0);
      otherwise:
                 printf("\nINVALID SELECTION...Please try again");
      }
      getch();
    }
    }
    -Sriharsha
    Help everyone you can

  4. #4
    Code Goddess Prelude's Avatar
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    >scanf("%1[1234]d%*c",&choice);
    And what happens if the user enters an invalid option after a valid one that doesn't end the loop? Say perhaps on the first iteration you enter 1, but the second you enter 7. This also won't work as you think because the [...] replaces the d format code, so you're actually reading 1 character that only accepts 1, 2, 3, or 4. So the switch will always print the default case unless you check for char literals instead of int literals.

    >while(choice!=4)
    This is an infinite loop, since you are entering chars and testing for ints this condition will never be met unless you know and can enter the EOT value in ASCII or the PF value in EBCDIC.

    >otherwise:
    I believe you mean default:.

    >return 0;
    This line is missing.

    Here's another way to do it. The program ignores multiple digit numbers when it should flag an error, but this will suffice for an example.
    Code:
    #include<stdio.h>
    #include<conio.h>
    #include<stdlib.h>
    
    int main ( void )
    {
      int choice=0;
      while(choice!='4')
      {
        clrscr();
        printf("\n\tMENU DEMONSTRATION");
        printf("\n\t------------------------------");
        printf("\n\n\t 1. OPTION 1");
        printf("\n\t 2. OPTION 2");
        printf("\n\t 3. OPTION 3");
        printf("\n\t 4. EXIT");
        printf("\n\n Enter Your Choice: ");
        choice = getche();
        switch(choice)
        {
        case '1':
          printf("\n\nYOU SELECTED OPTION 1\n");
          break;
        case '2':
          printf("\n\nYOU SELECTED OPTION 2\n");
          break;
        case '3':
          printf("\n\nYOU SELECTED OPTION 3\n");
          break;
        case '4':
          printf("\n\nYOU SELECTED OPTION 4\n");
          break;
        default:
          printf("\n\nINVALID SELECTION...Please try again\n");
        }
        (void)getch();
      }
      return 0;
    }
    -Prelude
    My best code is written with the delete key.

  5. #5
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    Smilk, did any of these replies confuse you? Did you receive enough help?
    The world is waiting. I must leave you now.

  6. #6
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    Interesting Way

    Code:
    #include <stdio.h>
    
    int menu(int MenuChoice);
    
    int main()
    {
    int WhereInMenu;
    char KeyTouched;
    
    WhereInMenu = 1;
    
    menu(1);
    
    for(;;)
    	{
    		KeyTouched = getch();
    		if (KeyTouched == 80)
    		{
    			WhereInMenu++;
    			if (WhereInMenu > 4)
    			{
    				WhereInMenu = 1;
    			}
    			menu(WhereInMenu);
    		}
    
    		else if (KeyTouched == 72)
    		{
    			WhereInMenu--;
    			if (WhereInMenu < 1)
    			{
    				WhereInMenu = 4;
    			}
    			menu(WhereInMenu);
    		}
    		else if (KeyTouched == 27)
    		{
    			system ("cls");
    			printf("Press Enter To Exit...");
                getch();
    			return 0;
    		}
    	}
    }
    
    
     
    int menu(int MenuChoice)
    {
    	switch (MenuChoice)
    		{
    		case 1:
    		system ("cls");
    		printf("\n* Option Number 1");
    		printf("\n  Option Number 2");
    		printf("\n  Option Number 3");
    		printf("\n  Option Number 4");
    		break;
    
    		case 2:
    		system ("cls");
      		printf("\n  Option Number 1");
    		printf("\n* Option Number 2");
    		printf("\n  Option Number 3");
    		printf("\n  Option Number 4");
    		break;
    
    		case 3:
    		system ("cls");
    		printf("\n  Option Number 1");
    		printf("\n  Option Number 2");
    		printf("\n* Option Number 3");
    		printf("\n  Option Number 4");
    		break;
    
    		case 4:
    		system ("cls");
    		printf("\n  Option Number 1");
    		printf("\n  Option Number 2");
    		printf("\n  Option Number 3");
    		printf("\n* Option Number 4");
    		break;
    
    		default:
    		system ("cls");
            printf("\nError");
    		}
    	return 0;
    }
    pr0ficient@hotmail.com

  7. #7
    ATH0 quzah's Avatar
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    While you may be 'pr0ficient', the initial poster was not. As such, your code will only confuse them.

    For example:

    If they don't know how to do simple menuing, there is great likelyhood that a blank 'for' loop will only confuse them.

    Additionally, you use screen clearing, which is non ANSI code. It's best when learning programming to stick with only the ANSI standard so you're sure your code will actually work where the poster is compiling.

    Quzah.
    Hope is the first step on the road to disappointment.

  8. #8
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    7
    Hi thanks everyone for trying to help me, obviously i found some of it pretty confusing, but still it has helped me loads, thanks alot.

  9. #9
    Registered User red_baron's Avatar
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    274

    Talking simple is best

    Code:
    #include <stdio.h>   //for printf and scanf satements
    int main()
    {
       int choice;
    
       /*Displaing on screen*/
       printf("-------Menu-------\n");
       printf("1) Program 1\n");
       printf("2) Program 2\n");
       printf("3) Program 3\n");
    
       /*getting input*/
       scanf("%d" &choice);
    
       system("CLS");
    
       /*Finding which choice was asked for (my style of using brackets may be different than yours*/
       if (choice==1)
       {
          printf("You chose program 1!\n");
       }
       else if (choice==2)
       {
          printf("You chose program 2!\n");
       }
       else if (choice==3)
       {
          printf("You chose program 3!\n");
       }
    
       system("PAUSE");
       return 0;
    }
    if u need more help putting your program together dont be afraid to e-mailing me:

    mori_bmg@hotmail.com
    Last edited by red_baron; 05-11-2002 at 06:37 PM.
    ¿Red Baron?

    "Imagination is more important than knowledge"
    -Albert Einstein (1879-1955)

    Check out my games!

    [code] /* dont forget code tags! */ [/code]

  10. #10
    End Of Line Hammer's Avatar
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    Originally posted by red_baron
    >scanf("%d" &choice);
    You didn't do any error checking here. What if a letter is entered by mistake? And you forgot the comma, so it won't compile for me anyway.

    >system("CLS");
    Read quzah's post. Here's a quote:
    >Additionally, you use screen clearing, which is non ANSI code.
    (The same goes for the system("PAUSE") call.)

    Also, system() lives in stdlib.h, which you haven't included.

    I think smilk has had enough confusion for one day
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

  11. #11
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    How was I able to compile my menu without including stdlib then?
    pr0ficient@hotmail.com

  12. #12
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    How was I able to compile my menu without including stdlib then?
    By some strange miracle...

  13. #13
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    He wasn't even talking to you.

    : : edit : :
    > Originally posted by red_baron
    :P
    Last edited by Shadow; 05-12-2002 at 12:05 AM.
    The world is waiting. I must leave you now.

  14. #14
    Im a Capricorn vsriharsha's Avatar
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    Hey,,
    I think this ammendment should work with out problems...

    [code]
    #include<stdio.h>
    #include<conio.h>
    int main()
    {
    char choice='0';
    while(choice!='4')
    {

    printf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n \n\n\n\n\n\n\n\n\n\tMENU DEMONSTRATION");
    printf("\n\t---------------------------------------------");
    printf("\n\n\t 1. OPTION 1");
    printf("\n\t 2. OPTION 2");
    printf("\n\t 3. OPTION 3");
    printf("\n\t 4. EXIT");
    printf("\n\n Enter Your CHoice: ");
    scanf("%1[1234]c%*c",&choice);
    switch(choice)
    {
    case '1':
    printf("\nYOU SELECTED OPTION 1 %c",1);
    break;
    case '2':
    printf("\nYOU SELECTED OPTION 1 %c",2);
    break;
    case '3':
    printf("\nYOU SELECTED OPTION 1 %c",3);
    break;
    case '4':
    printf("\nYOU SELECTED OPTION 1 %c",4);
    exit(0);
    default:
    printf("\nINVALID SELECTION...Please try again");
    }
    getch();
    }
    return 0;
    }


    - Or do any problems still exist..

    -Sriharsha
    Help everyone you can

  15. #15
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    How was I able to compile my menu without including stdlib then?
    the compiler will assume whatever function you dont include a header for is extern and search the standard headers then headers in the directory your working from for the matching function
    PHP Code:
    int main()
        {
            
    printf("testing...one...two...cheeze!");
        } 
    this works great without stdio.h but it still warns me
    warning C4013: 'printf' undefined; assuming extern returning int
    i dont get how this works can someone explain?
    scanf("%1[1234]c%*c",&choice);

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