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char buff[25]; char *end_ptr; long sl; if (fgets(buff, sizeof(buff), stdin) == NULL) { if (puts("EOF or read error\n"); == EOF) { /* Handle Error */ } } else { errno = 0; sl = strtol(buff, &end_ptr, 10); if (ERANGE == errno) { if (puts("number out of range\n"); == EOF) { /* Handle Error */ } } else if (end_ptr == buff) { if (puts("not valid numeric input\n"); == EOF) { /* Handle Error */ } } else if ('\n' != *end_ptr && '\0' != *end_ptr) { if (puts("extra characters on input line\n"); == EOF) { /* Handle Error */ } } } |
Note that this solution treats any trailing characters, including white-space characters, as an error condition.
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