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Convert a character to uppercase
#include <ctype.h>
int toupper( int c );
- c
- The character that you want to convert.
libc
Use the -l c option to
qcc
to link against this library.
This library is usually included automatically.
The toupper() function converts c to a uppercase letter,
if c represents a lowercase letter.
The corresponding uppercase letter when the argument is a lowercase letter;
otherwise, the original character is returned.
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
char chars[] = {
'a',
'5',
'$',
'z'
};
#define SIZE sizeof( chars ) / sizeof( char )
int main( void )
{
int i;
for( i = 0; i < SIZE; i++ ) {
printf( "%c ", toupper( chars[ i ] ) );
}
printf( "\n" );
return EXIT_SUCCESS;
}
produces the output:
A 5 $ Z
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(),
isupper(),
isxdigit(),
strlwr(),
strupr(),
tolower()
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