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Synopsis:
    #include <ctype.h>
    int toupper( int c );

Description:
    The toupper function converts a lowercase character to the corresponding
    uppercase character.

Returns:
    The toupper function returns the corresponding uppercase letter when the
    argument is an lowercase letter; otherwise, the original character is
    returned.

See Also:
    isalnum, isalpha, iscntrl, isdigit, isgraph, islower, isprint, ispunct,
    isspace, isupper, isxdigit, strlwr, _fstrlwr, strupr, _fstrupr, tolower

Example:
    #include <stdio.h>
    #include <ctype.h>

    char chars[] = {
        'a',
        '5',
        '$',
        'z'
    };

    #define SIZE sizeof( chars ) / sizeof( char )

    void main()
      {
        int   i;

        for( i = 0; i < SIZE; i++ ) {
            printf( "%c ", toupper( chars[ i ] ) );
        }
        printf( "\n" );
      }

    produces the following:

    A 5 $ Z

Classification:
    ANSI

Systems:
    All