cant get the loop to work right

This is a discussion on cant get the loop to work right within the C Programming forums, part of the General Programming Boards category; im trying to create a program that right justifies the text entered by the user.. i already figured how to ...

  1. #1
    Registered User
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    Oct 2002
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    5

    cant get the loop to work right

    im trying to create a program that right justifies the text entered by the user.. i already figured how to justify the text i just dont know how to get out of the loop that i created .. here's my code :
    Code:
    #include<stdio.h>
    #include<stdlib.h>
    #define Maxlength 200
    
    void justify(int x, char parag[Maxlength + 1]);
    
    main()
    {
    
          int length, ans;
          char text[Maxlength + 1];
          printf("Enter 1 to continue, any key to stop ");
          scanf("%d", &ans);
          while(ans == 1)
          {
             printf("Enter length of the line ");
             scanf("%d", &length);
             printf("Enter text:\n");
             justify(length, text);
             printf("\nEnter 1 to continue, any key to stop ");
             scanf("%d", &ans);
          }
    }
    
    void justify(int x, char parag[Maxlength + 1])
    {
    
       int currlinelength = 0;
       int wordlength;
       while(scanf("%s", parag) != EOF)
       {
       for(wordlength = 0; parag[wordlength] != '\0'; wordlength++)
          ;
       if(wordlength > x)
          printf("\nERROR: word length exceeds line length");
       if(currlinelength == 0)
       {
          printf("%s", parag);
          currlinelength = wordlength;
       }
       else
       {
          currlinelength += wordlength + 1;
             if(currlinelength > x)
             {
                printf("\n%s", parag);
                currlinelength = wordlength;
             }
             else
                printf(" %s", parag);
       }
       }
    }
    first off i try to ask the user if they want to continue.. after the user is done entering the text, i try to ask them again if they want to continue, but the program just stops once it's done justifying the entered text. . i cant seem to figure out how to have that statement "Enter 1 to continue ...." to show up again.. does anyone know what the problem is ?? thanx in advance

  2. #2
    Confused Magos's Avatar
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    Make sure ans is set to a value different from 1, and the loop will end.
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  3. #3
    Registered User
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    Oct 2002
    Posts
    5
    but i cant get it to show the prompt ... "Enter 1 to continue any key to stop" .. so i cant enter any value for ans ... do u think the problem is with the while statement in the void justify function?
    Code:
    void justify(int x, char parag[Maxlengfth + 1])
    while(scanf("%s", parag) != EOF)
    {
    }

  4. #4
    End Of Line Hammer's Avatar
    Join Date
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    Posts
    6,231
    If you're testing for EOF from scanf(), the only time you'll get this is when stdin has finished providing data to your program; eg the user has hit CTRL+D/Z (OS dependant key). Once this has happened, I am presuming that further calls to scanf() would be unrealiable, but this isn't something I've bothered looking at before.


    Also, you do realise that scanf() using %s will input a word only, not a group of words? Maybe you'd be better using fgets().
    When all else fails, read the instructions.
    If you're posting code, use code tags: [code] /* insert code here */ [/code]

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