Inverse printing.

This is a discussion on Inverse printing. within the C Programming forums, part of the General Programming Boards category; I'm sure the answer will be really easy, however i need to have the output of this inversed so i ...

  1. #1
    Registered User caroundw5h's Avatar
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    Oct 2003
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    Inverse printing.

    I'm sure the answer will be really easy, however i need to have the output of this inversed so i get
    F
    FE
    FED
    FEDC
    FEDCB
    FEDCBA
    here is my code, please let me know what is wrong with it.
    Code:
       /* alpha dependant nested loops.c */
    
    
    #include <stdio.h>
    #define ROW 6
    
    
    int main(void)
    
    
    {
        int row;
        char ltr;
    
        for (row = 0; row < ROW; row++){
            for (ltr = ('F' - row); ltr <('A' + ROW); ltr++)
                printf("%c", ltr );
             printf("\n");
    
             }
    
    
         getchar();
    
         return (0);
    
    
    }

  2. #2
    Code Goddess Prelude's Avatar
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    9,796
    Well, my preference would be to work with a string so that I wouldn't have to assume the ASCII character set:
    Code:
    #include <stdio.h>
    
    int main ( void )
    {
      char *p = "FEDCBA";
      int i, j;
    
      for ( i = 0; p[i] != '\0'; i++ ) {
        for ( j = 0; j <= i; j++ )
          printf ( "%c", p[j] );
        printf ( "\n" );
      }
    
      return 0;
    }
    But, with the right assumptions in hand, your way works too:
    Code:
    #include <stdio.h>
    
    int main ( void )
    {
      char i, j;
    
      for ( i = 'F'; i >= 'A'; i-- ) {
        for ( j = 'F'; j >= i; j-- )
          printf ( "%c", j );
        printf ( "\n" );
      }
    
      return 0;
    }
    My best code is written with the delete key.

  3. #3
    Registered User caroundw5h's Avatar
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    Interesting, you used too char loops since its the same count as integers anyaway. Very interesting. I never thought about doing that. Thank you very much prelude.

    Well, my preference would be to work with a string so that I wouldn't have to assume the ASCII character set:
    I haven't delved into pointers and strings yet, so i'm still a little behind. However i do understand your code with the char pointer? in it. I will be studying that code.



  4. #4
    Visionary Philosopher Sayeh's Avatar
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    Aug 2002
    Posts
    212
    The 'why' it isn't working can be found using a flowchart and your knowledge of standard 'C'.
    It is not the spoon that bends, it is you who bends around the spoon.

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