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

/* mytolower: c を小文字に変換する；ASCIIのみ */
int mytolower(int c)
{
	if( c >= 'A' && c <='Z' )
		return( c + 'a' - 'A' );
	else
		return( c );
}

main()
{
	int c, n;

	for( n = 0, c = 0; c <= 127; c++ )
		if( isprint(c) )
		{
			printf("%02x=%c  ", c, c );
			if( ++n%8 == 0 )
				printf("\n");
		}
	printf("\n");
	for( n = 0, c = 0; c <= 127; c++ )
		if( tolower(c) != mytolower(c) )
		{
			printf("tolower(%02x)=%02x, mytolower(%02x)=%02x\n", c, tolower(c), c, mytolower(c) );
			n++;
		}
	if( n == 0 )
		printf("mytolower() is OK!\n");
	else
		printf("mytolower() is NG!\n");
}

/* end of testmytolower.c */