iscntrl
int iscntrl ( int c );
- Check if character is a control character
- 检查给定字符是否为控制字符，即编码 0x00-0x1F 及 0x7F 。
若 c 的值不能表示为 unsigned char 且不等于 EOF ，则行为未定义。
Parameters
c
- Character to be checked, casted as an int, or EOF.
- c - 要分类的字符
Return Value
- A value different from zero (i.e., true) if indeed c is a control character. Zero (i.e., false) otherwise.
- 若字符为控制字符则为非零，否则为零。
Example
//
// Created by zhangrongxiang on 2018/2/1 15:14
// File iscntrl
//
#include <stdio.h>
#include <ctype.h>
#include <locale.h>
int main() {
unsigned char c = 'x94'; // ISO-8859-1 的控制码 CCH
printf("In the default C locale, \x94 is %sa control character
",
iscntrl(c) ? "" : "not ");
//In the default C locale, x94 is not a control character
setlocale(LC_ALL, "en_GB.iso88591");
printf("In ISO-8859-1 locale, \x94 is %sa control character
",
iscntrl(c) ? "" : "not ");
int i = 0;
char str[] = "first line
second line
";
while (!iscntrl(str[i])) {
putchar(str[i]);
i++;
}
//first line
return 0;
}