Page 166 - C-Language

/* write a 16-bit little endian integer */
int fput16le(int x, FILE *fp)
{
unsigned int rep = x;
int e1, e2;

e1 = fputc(rep & 0xFF, fp);
e2 = fputc((rep >> 8) & 0xFF, fp);

if(e1 == EOF || e2 == EOF)
return EOF;
return 0;
}

The other functions follow the same pattern with minor modifications for size and byte order.

fscanf()

Let's say we have a text file and we want to read all words in that file, in order to do some
requirements.

file.txt:

This is just
a test file
to be used by fscanf()

This is the main function:

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

void printAllWords(FILE *);

int main(void)
{
FILE *fp;

if ((fp = fopen("file.txt", "r")) == NULL) {
perror("Error opening file");
exit(EXIT_FAILURE);
}

printAllWords(fp);

fclose(fp);

return EXIT_SUCCESS;
}

void printAllWords(FILE * fp)
{
char tmp[20];
int i = 1;

while (fscanf(fp, "%19s", tmp) != EOF) {
printf("Word %d: %s\n", i, tmp);

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