C Language Files and I/O streams fscanf()
Example
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);
i++;
}
}
The output will be:
Word 1: This
Word 2: is
Word 3: just
Word 4: a
Word 5: test
Word 6: file
Word 7: to
Word 8: be
Word 9: used
Word 10: by
Word 11: fscanf()
