automatic carriage return?

This is a discussion on automatic carriage return? within the C Programming forums, part of the General Programming Boards category; I'm using DJGPP C compiler. Trying sample code. I don't know why this code when run will not let me ...

  1. #1
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    automatic carriage return?

    I'm using DJGPP C compiler. Trying sample code. I don't know why this code when run will not let me input the second string to compare. It just seems to automatically hit enter on it and go to asking for input on # of characters to compare.

    Code:
    include <stdio.h>
    #include <string.h>
    
    main()
    {
    	char	string1[20];
    	char	string2[20];
    	int	length;
    
    	printf("\nEnter first string to compare   :");
    	scanf("%s",string1);
    	
    	printf("\nEnter second string to compare  :");
    	scanf("%s",string2);
    
    	printf("\nEnter the number of characters to compare  :");
    	scanf("%d",&length);
    
    	if(!strncmp(string1,string2,length))
    	  printf("The first %d characters of String 1 equals String 2\n",length);
    }

  2. #2
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    ok, here's an example of it running:

    Code:
    Microsoft Windows 2000 [Version 5.00.2195]
    (C) Copyright 1985-2000 Microsoft Corp.
    
    C:\DJGPP\Mystuff>string
    Cannot load VDM IPX/SPX support
    
    Enter first string to compare   :Hello world!
    
    Enter second string to compare  :
    Enter the number of characters to compare  :8
    
    C:\DJGPP\Mystuff>

  3. #3
    Registered User ssharish2005's Avatar
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    To know why study this

    And call this function after your first call to scanf()

    Code:
    void clear_buffer(void)
    {
         int ch;
    
        while( (ch = getchar() ) != '\n' && ch != EOF );
    }
    ssharish

  4. #4
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    LOL! ok book was written around/before 94. No Win2k back then.

  5. #5
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    Thanks for the help! This problem seem to not be present on my Windows 95 machine. Must be an NT/2K/XP OS problem.

    And after trying it it appears I will have to call it after every scanf read/call/whatever.

  6. #6
    Just Lurking Dave_Sinkula's Avatar
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    Here's a tip: avoid scanf for user input. Instead prefer fgets possibly followed by sscanf or newline trimming of a string.
    http://faq.cprogramming.com/cgi-bin/...&id=1043284385
    7. It is easier to write an incorrect program than understand a correct one.
    40. There are two ways to write error-free programs; only the third one works.*

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