Input/Output

This is a discussion on Input/Output within the C Programming forums, part of the General Programming Boards category; I am having a problem with input/output. I have created a text file called input.txt and want to move this ...

  1. #1
    Registered User
    Join Date
    Dec 2001
    Posts
    2

    Question Input/Output

    I am having a problem with input/output. I have created a text file called input.txt and want to move this to output.txt
    I have been able to move a single character over with %c but when I have tried to use %s it doesn't appear to work.

    This is the code I have used:

    #include <stdio.h>
    #include <stdlib.h>
    #include <conio.h>

    void main (void)
    {
    char e[30];
    char temp_char;
    int counter;

    FILE *f_input;
    FILE *f_output;

    for(counter=0; counter<200; counter++)

    if ((f_input = fopen("input.txt","r"))==NULL)
    {
    printf("Cannot open file\n");
    exit(1);
    }

    fscanf(f_input,"%c", &temp_char[counter]);
    if ((f_output = fopen("output.txt","w"))==NULL)
    {
    printf("Cannot open file for writing\n");
    exit(1);
    }

    fprintf(f_output,"The input file contained the following: %c \n",temp_char);

    fclose(f_input);
    fclose(f_output);

    getch();
    }

    Can anyone help, thanks if you can.

  2. #2
    Registered User C_Coder's Avatar
    Join Date
    Oct 2001
    Posts
    523
    try this
    Code:
    int main()
    {
         int ch;
         FILE *f_input, *f_output;
    
         if ((f_input = fopen("input.txt","r"))==NULL) 
        { 
              printf("Cannot open file\n"); 
              exit(1); 
        } 
       
        if ((f_output = fopen("output.txt","w"))==NULL) 
        { 
              printf("Cannot open file for writing\n"); 
              exit(1); 
        }  
    
         
    
         while((ch = fgetc(f_input)) != EOF)
              fputc(ch, f_output);
    
         fclose(f_input);
         fclose(f_output);
         return 0;
    }
    look up fgetc, fputc and EOF in your documentation
    Last edited by C_Coder; 12-02-2001 at 06:30 AM.
    All spelling mistakes, syntatical errors and stupid comments are intentional.

  3. #3
    Registered User
    Join Date
    Dec 2001
    Posts
    2
    Thanks for that - It is now working.

    Out of interest, if I wished to transfer message over but this time backwards will I be ok to use a'For' loop?

  4. #4
    Code Warrior
    Join Date
    Nov 2001
    Posts
    669
    Of course.

    You just read the message from the end to the start and print it out on the screen.
    Last edited by GaPe; 12-02-2001 at 07:15 AM.
    Current projects:
    1) User Interface Development Kit (C++)
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