C library functions - iscntrl ()
C standard library - <ctype.h>
description
Whether the C library functionvoid iscntrl (int c) Check preaching character is a control character.
According to the standard ASCII character set, control characters of ASCII code between 0x00 (NUL) and 0x1f (US), and 0x7f (DEL), certain platform-specific compiler implementations can also be extended character set (0x7f above) in define additional control characters.
statement
The following is a statement iscntrl () function.
int iscntrl(int c);
parameter
- c - This was a test of character.
return value
If c is a control character, the function returns a nonzero value, otherwise return 0.
Examples
The following example demonstrates the use of iscntrl () function.
#include <stdio.h>
#include <ctype.h>
int main ()
{
int i = 0, j = 0;
char str1[] = "all \a about \t programming";
char str2[] = "w3cschool \n tutorials";
/* 输出字符串直到控制字符 \a */
while( !iscntrl(str1[i]) )
{
putchar(str1[i]);
i++;
}
/* 输出字符串直到控制字符 \n */
while( !iscntrl(str2[j]) )
{
putchar(str2[j]);
j++;
}
return(0);
}
Let's compile and run the above program, which will result in the following:
all w3cschool