Thread: Program to view 10 lines of file.

  1. #1
    Registered User
    Join Date
    Apr 2018
    Posts
    2

    Question Program to view 10 lines of file.

    I'm having trouble writing a program that counts ten lines and displays only the characters from those lines. I want the program to read the characters one at a time from the file. I have here the code I've managed to write so far. Any help would be greatly appreciated.

    Code:
    #include<stdio.h>
    #include<stdlib.h>
    #define FNLEN 100
    
    int main(void)
    {
        FILE *input;
        
        
        char infilename[FNLEN];
        char character;
        int line_count;
        
        printf("Enter name of text three you wish to preview: ");
        scanf("%s", infilename);
        
        input = fopen(infilename, "r");
        
        while ((input = fopen(infilename, "r"))) == NULL)
        {
            printf("%s is an invalid name.\n", infilename);
            printf("Please enter valid file name. ");
            scanf("%s", infilename);
        }
        while (fscanf(input, "%c", &character) != EOF)
        {
            if
        }
        
        
    }

  2. #2
    Registered User
    Join Date
    Apr 2018
    Posts
    10
    I'd use fgets to get the filename or better just pass it as a command line argument. Also you don't really need fscanf to read a file character by character, fgetc is way better.
    Something like this should do the trick:

    Code:
        #define N_LINES 10
    
        FILE *f;
        int c;
        size_t n_spaces;
        n_spaces = 0;
    
    
        while (EOF != (c = fgetc(f)) && (N_LINES + 1) != n_spaces)
        {
            if('\n' == c)
                ++n_spaces;
            if(N_LINES != n_spaces)
                putchar(c);
        }
        
        fclose(f);

  3. #3
    Registered User
    Join Date
    May 2012
    Location
    Arizona, USA
    Posts
    783
    Does the advice on your other thread help at all?

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