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Test a character to see if it's an uppercase letter
#include <ctype.h>
int isupper( int c );
- c
- The character you want to test.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The isupper() function tests for any uppercase letter A
through Z.
Nonzero if c is an uppercase letter; otherwise, zero.
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
char the_chars[] = { 'A', 'a', 'z', 'Z' };
#define SIZE sizeof( the_chars ) / sizeof( char )
int main( void )
{
int i;
for( i = 0; i < SIZE; i++ ) {
if( isupper( the_chars[i] ) ) {
printf( "Char %c is an uppercase character\n",
the_chars[i] );
} else {
printf( "Char %c is not an uppercase character\n",
the_chars[i] );
}
}
return EXIT_SUCCESS;
}
produces the output:
Char A is an uppercase character
Char a is not an uppercase character
Char z is not an uppercase character
Char Z is an uppercase character
ANSI,
POSIX 1003.1
Safety: | |
Cancellation point |
No |
Interrupt handler |
Yes |
Signal handler |
Yes |
Thread |
Yes |
isalnum(),
isalpha(),
iscntrl(),
isdigit(),
isgraph(),
islower(),
isprint(),
ispunct(),
isspace(),
iswupper(),
isxdigit(),
tolower(),
toupper()
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