Do while help please

This is a discussion on Do while help please within the C Programming forums, part of the General Programming Boards category; Im making a do while loop for C and the part I'm having trouble with looks like this Code: char ...

  1. #1
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    Do while help please

    Im making a do while loop for C and the part I'm having trouble with looks like this


    Code:
    char y;
    
    do
    	{
    	printf("On this machine the number of bytes in a char is : %d\n", sizeof(char));
    
    	printf("On this machine the number of bytes in a short is : %d\n", sizeof(short));
    
    	printf("On this machine the number of bytes in a int is : %d\n", sizeof(int));
    
    	printf("On this machine the number of bytes in a long is : %d\n", sizeof(long));
    
    	printf("On this machine the number of bytes in a float is : %d\n", sizeof(float));
    
    	printf("On this machine the number of bytes in a double is : %d\n", sizeof(double));
    
    	printf("On this machine the number of bytes in a pointer is : %d\n", sizeof(char));
    
    	printf("On this machine the number of bytes in a struct is : %d\n", sizeof(struct student));
    
    	printf("Would you like to see the information again?\n");
    
    
    
    y = getchar();
    
    }
    
    while (scanf("%s",&y));
    
    while (y == 'y');
    
    while (y != EOF);
    
    
    }

    Well im new to this programming stuff, but im suppose to make a program that displays all those "On this machine" quotes everytime the user enters the letter "y". And if the user enters anything else, the program is suppose to print out : "Goodbye" and exit the program. The problem is that whenever i execute and enter "y", it prints out "on this machine", which is what I want. But i dont know how to get it to print "goodbye" and exit.

    If anyone could help me, I will love you long time.

  2. #2
    ATH0 quzah's Avatar
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    Quote Originally Posted by joshua
    Im making a do while loop for C and the part I'm having trouble with looks like this


    Code:
    char y;
    
    do
    {
        y = getchar(); /* Read something into y*/
    
    } while (scanf("%s",&y)); /* Now treat the single character y as a string... */
    /* Your do-while is officially over. */
    
    while (y == 'y'); /* while y is 'y', do nothing at all, indefinately */
    /* Your plain old 'while' loop is over, if at all possible. */
    
    while (y != EOF);  /* See above, except test for EOF, except you can't. */
    /* Your THIRD loop is now over. */
    
    
    }
    The EOF FAQ will tell you why it's wrong to use a char to test for EOF.

    Keep the love for someone who wants it.


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

  3. #3
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    when you say my do while loop is over, do you mean it wont loop anymore?

  4. #4
    Registered User TactX's Avatar
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    Ermm, is it just me, or is this thread somehow familiar to this one?

  5. #5
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    I Love You!!!

  6. #6
    and the hat of wrongness Salem's Avatar
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    > or is this thread somehow familiar to
    Well both posters are from the same school, so I guess they're both in the same class as well.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  7. #7
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    Code:
    int y = 0;
    
    do
    {
       /* statements */
      y = getchar();
    } while (y == 'y' || y == 'Y');
    Something similair to this is what you want.

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