...
| Code Block | ||
|---|---|---|
| ||
FILE *fptr = NULL;
int c = 'a';
while (c <= 'z') {
if (putc(c++, fptr ? fptr :
(fptr = fopen(file_name, "w")) == EOF)
{
/* Handle Error */
}
}
|
If the putc() macro evaluates its stream argument multiple times, this might still seem safe, as the ?: operator ostensibly prevents multiple calls to fopen(). However, there is no guarantee that these would happen in distinct sequence points. Consequently this code also violates EXP30-C. Do not depend on order of evaluation between sequence points.
...