函数名: getchar
功 能: 从stdin流中读字符
用 法: #include <stdio.h>
int getchar(void);
程序例:
#include <stdio.h>
int main(void)
{
int c;
/* Note that getchar reads from stdin and
is line buffered; this means it will
not return until you press ENTER. */
while ((c = getchar()) != '\n')
printf("%c", c);
return 0;
}