1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | #include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <stdbool.h>
#include "clog.h"
// Get size of file using ftell(…).
//
// ftell(fp) tells you the current position of fp.
char const* write_file(char const* s, char const* filename) {
FILE* fp = fopen(filename, "w");
fputs(s, fp);
fclose(fp);
return filename;
}
int main(int argc, char* argv[]) {
char const* filename = "d.txt";
write_file("ABC", filename);
// Open file
FILE* fp = fopen(filename, "r");
// Set position to end of file.
fseek(fp, 0, SEEK_END);
// Get current position.
int num_chars_in_file = ftell(fp);// get current position relative to beginning of file
// Close file.
fclose(fp);
// Report answer.
printf("There are %d characters in file \"%s\".\n", num_chars_in_file, filename);
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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