Updated: April 19, 2023 |
Test a character to see if it's a whitespace character
#include <ctype.h> int isspace( int c );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The isspace() function tests for the following whitespace characters:
The isblank() function tests for a narrower set of characters.
Nonzero if c is a whitespace character; otherwise, zero.
#include <stdio.h> #include <stdlib.h> #include <ctype.h> char the_chars[] = { 'A', 0x09, ' ', 0x7d, '\n' }; #define SIZE sizeof( the_chars ) / sizeof( char ) int main( void ) { int i; for( i = 0; i < SIZE; i++ ) { if( isspace( (unsigned)the_chars[i] ) ) { printf( "Char %c is a space character\n", the_chars[i] ); } else { printf( "Char %c is not a space character\n", the_chars[i] ); } } return EXIT_SUCCESS; }
This program produces the output:
Char A is not a space character Char is a space character Char is a space character Char } is not a space character Char is a space character
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | Yes |
Signal handler | Yes |
Thread | Yes |