myuclc.c

apue第二版每一章节的c语言源码

#include	<ctype.h>
#include	"ourhdr.h"

int
main(void)
{
	int		c;

	while ( (c = getchar()) != EOF) {
		if (isupper(c))
			c = tolower(c);
		if (putchar(c) == EOF)
			err_sys("output error");
		if (c == '\n')
			fflush(stdout);
	}
	exit(0);
}