C Primer Plus, Fourth Edition

Chapter 12

1:

What's wrong with this program? int main(void) { int * fp; int k; fp = fopen("gelatin"); for (k = 0; k < 30; k++) fputs(fp, "Nanette eats gelatin."); fclose("gelatin"); return 0; }

A1:

It should have #include <stdio.h> for its file definitions. It should declare fp a file pointer: FILE *fp;. The function fopen() requires a mode: fopen("gelatin", "w"), or perhaps the "a" mode. The order of the arguments to fputs() should be reversed. For clarity, the output string should have a newline because fputs() doesn't add one automatically. The fclose() function requires a file pointer, not a filename: fclose(fp);. Here is a corrected version: #include <stdio.h> int main(void) { FILE * fp; int k; fp = fopen("gelatin", "w"); for (k = 0; k ...