To simplify the code , the getc () method returns the next character from the buffer while putc () replaces the character in the buffer where it is available for the next call to getc () .
要简化该代码，getc（）方法返回缓冲区中的下一个字符，而putc（）替换缓冲区中getc（）下一次调用的字符。
putc