Opens an existing file and changes one letters to an *, then prints the changed content. - C Pointer

C examples for Pointer:Pointer Variable

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Description

Opens an existing file and changes one letters to an *, then prints the changed content.

Demo Code

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

FILE * fptr;// ww w . j  a v a 2 s . co m

int main()
{
    char letter;
    int i = 6;

    fptr = fopen("C:\\test\\letters.txt", "r+");

    if (fptr == 0){
        printf("There was an error while opening the file.\n");
        exit(1);
    }
    // Seeks that position from the beginning of the file

    fseek(fptr, (i-1), SEEK_SET); // Subtract 1 from the position
                                  // because array starts at 0

    // Write an * over the letter in that position
    fputc('*', fptr);

    // Now jump back to the beginning of the array and print it out

    fseek(fptr, 0, SEEK_SET);

    printf("Here is the file now:\n");

    for (i = 0; i < 26; i++)
    {
        letter = fgetc(fptr);
        printf("The next letter is %c.\n", letter);
    }

    fclose(fptr);
    return(0);
}

Result


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