华中科技大学计算机系统基础实验报告

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课程实验报告

课程名称：计算机系统基础

专业班级：学号：姓名：指导教师：

报告日期： 2016年 5月 24 日

计算机科学与技术学院

实验1： ................................. 错误!未定义书签。实验2： ................................. 错误!未定义书签。实验3： ................................. 错误!未定义书签。实验总结 ................................. 错误!未定义书签。

实验1：数据表示

实验概述

本实验的目的是更好地熟悉和掌握计算机中整数和浮点数的二进制编码表示。

实验中,你需要解开一系列编程“难题”——使用有限类型和数量的运算操作实现一组给定功能的函数,在此过程中你将加深对数据二进制编码表示的了解。

实验语言:c; 实验环境: linux

实验内容

需要完成中下列函数功能,具体分为三大类:位操作、补码运算和浮点数操作。

实验设计

源码如下： /*

* lsbZero - set 0 to the least significant bit of x * Example: lsbZero(0x) = 0x * Legal ops: ! ~ & ^ | + << >> * Max ops: 5 * Rating: 1 */

int lsbZero(int x) {

* Examples: mult3div2(11) = 16 * mult3div2(-9) = -13

* mult3div2(24) = -2(overflow) * Legal ops: ! ~ & ^ | + << >> * Max ops: 12 * Rating: 2 */

int mult3div2(int x) {

* You may assume -TMax <= x <= TMax * Legal ops: ! ~ & ^ | + << >> * Max ops: 10

* Rating: 4 */

int absVal(int x) {

* Both the argument and result are passed as unsigned int's, but * they are to be interpreted as the bit-level representations of * single-precision floating point values. * When argument is NaN, return argument..

* Legal ops: Any integer/unsigned operations incl. ||, &&. also if, while

* Max ops: 10 * Rating: 2 */

unsigned float_abs(unsigned uf) { int x=uf&(~(1<<31)); if(x>0x7f800000) {

return uf; }

else return x; } /*

* float_f2i - Return bit-level equivalent of expression (int) f * for floating point argument f.

* Argument is passed as unsigned int, but

* it is to be interpreted as the bit-level representation of a * single-precision floating point value.

* Anything out of range (including NaN and infinity) should return * 0xu.

* Legal ops: Any integer/unsigned operations incl. ||, &&. also if, while

* Max ops: 30 * Rating: 4 */

int float_f2i(unsigned uf) { unsigned num=0x;