Test a character to see if it's any printable character, including a space
#include <ctype.h> int isprint( int c );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The isprint() function tests for any printable character, including a space (' '). The isgraph() function is similar, except that the space character is excluded from the character set being tested.
Nonzero if c is a printable character; otherwise, zero.
#include <stdio.h> #include <stdlib.h> #include <ctype.h> char the_chars[] = { 'A', 0x09, ' ', 0x7d }; #define SIZE sizeof( the_chars ) / sizeof( char ) int main( void ) { int i; for( i = 0; i < SIZE; i++ ) { if( isprint( the_chars[i] ) ) { printf( "Char %c is a printable character\n", the_chars[i] ); } else { printf( "Char %c is not a printable character\n", the_chars[i] ); } } return EXIT_SUCCESS; }
produces the output:
Char A is a printable character Char is not a printable character Char is a printable character Char } is a printable character
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | Yes |
Signal handler | Yes |
Thread | Yes |
isalnum(), isalpha(), iscntrl(), isdigit(), isgraph(), islower(), ispunct(), isspace(), isupper(), iswprint(), isxdigit(), tolower(), toupper()