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

Description:
    The isupper function tests for any uppercase letter 'A' through 'Z'.

Returns:
    The isupper returns a non-zero value when the argument is an uppercase
    letter; otherwise, zero is returned.

See Also:
    isalnum, isalpha, iscntrl, isdigit, isgraph, islower, isprint, ispunct,
    isspace, isxdigit, tolower, toupper

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

    char chars[] = {
        'A',
        'a',
        'z',
        'Z'
    };

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

    void main()
      {
        int   i;

        for( i = 0; i < SIZE; i++ ) {
          printf( "Char %c is %san uppercase character\n",
                chars[i],
                ( isupper( chars[i] ) ) ? "" : "not " );
        }
      }

    produces the following:

    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

Classification:
    ANSI

Systems:
    All