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

Description:
    The tolower function converts an uppercase letter to the corresponding
    lowercase letter.

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

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

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 ", tolower( chars[ i ] ) );
        }
        printf( "\n" );
      }

    produces the following:

    a 5 $ z

Classification:
    ANSI

Systems:
    All