C-使用文本文件

Question

Basically, I'm working on a small program in C (again, not a homework task, just some experimentation while I'm away from Uni :) ). My goal is to take a file containing lots of words all seperated by spaces, loop through the file, and whenever a space is found, replace that for a \\n thus creating a large list of words.

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
/*
 * 
*/
int main(int argc, char** argv) {

char myFile[100];
int i;
FILE *file;
while(argc--) {
    printf("%s\n", *argv++);
}

return 0;
}

Very basic what I have so far, what I need to do next is to take the arguement and whack it in the myFile array, so that I can use that as the fopen, or maybe there is another way to do this?

Beyond that, my idea was to then read a line, into an array via fgets, loop through it char by char, searching for ' ', if I find it, replace is for \\n, then rewrite that line to the file. Does this sound sensible, doable?

Regards,

and Thanks!

Answer 1

the simplest way is to open the file in binary mode

FILE *fpIn = fopen( argv[1], "rb" );

then open a new file for writing

FILE* fpOut =  fopen( "tmp.out", "wb" );

and read byte by byte from fpIn using fgetc and write using fputc to the new file

before writing check if the byte is a space (use isspace() ), write a '\\n' instead.

then delete original and rename tmp.out to argv[1]

Answer 2

This is pretty much exactly what K&R Exercise 1-12 asks you to do (you could redirect the input file to standard input alternately, if you want to skip the file pointers). It's a good exercise.

FYI, a good resource for K&R solutions: http://clc-wiki.net/wiki/K&R2_solutions