C语言K&R习题系列——使用缓冲区函数接受长字符输入

来源：互联网发布：java long 长度编辑：程序博客网时间：2024/06/07 03:06

原题：

Write a program to print all input lines that are longer than 80 characters.

实现起来不算难，关键是用到了缓冲区，很不错的一种思想！

/* Write a program to print all input lines * that are longer than 80 characters */   #include < stdio.h >   #define MINLENGTH 81   /*readbuff: read all input characters*/ int readbuff ( char *buffer ) {    size_t i = 0;    int c;         while( i < MINLENGTH )    {        c = getchar();                 if ( c == EOF )        {            return -1;        }        if ( c == '\n' )        {            return 0;        }                 buffer[i++] = c;    }         return 1; }   /*copyread: copy the inputs that longer than 80 characters*/ int copyread ( char *buffer ) {    size_t i;    int c;    int status;         status = 1;         for ( i = 0; i < MINLENGTH; i++ )    {        putchar ( buffer[i++] );    }    while ( status == 1 )    {        c = getchar();        if ( c == EOF )        {            status = -1;        }        else if ( c == '\n' )        {            status = 0;        }        else        {            putchar(c);        }        putchar ( '\n' );    }    return status; }   /*print the inputs that longer than 80 characters*/ main ( void ) {    int status;    char buffer[MINLENGTH];         /*initialize*/    status = 1;    while ( status != -1 )    {        status = readbuff ( buffer );        if ( status == 1 )        {            status = copyread ( buffer );        }             }         return 0; }

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