8.1 echo.c -- 重复 输入
#include <stdio.h>
int main(void)
{
char ch;
while ((ch = getchar()) != '#')
putchar(ch);
return 0;
}
#include <stdio.h>
int main(void)
{
char ch;
while ((ch = getchar()) != '#')
putchar(ch);
return 0;
}