Decreasing size of data For uns_程序员之家(Rule of Sign Extension)

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引言： Decreasing size of data For uns

·extened precision arithmetic instructions »显示摘要«

摘要：adc operand1 = operand1 + carry flag + operand2 sbb operand1 = operand1 - carry flag - operand2 ......

摘要：abstraction : as extended machines virtualization : as virtual machines resource management : as resource managers ......

Rule of Sign Extension

decreasing size of data

【程序编程相关:JAVA代码编写的30条建议】

for unsigned numbers: 【推荐阅读:[系列第2篇]《共享软件走向国际指南》】

for signed numbers: 【扩展信息:[系列第3篇]《顿悟：SW该怎么做》】

all the bits being removed must be 0 !

bits being removed must be all 1´s or 0´s and the first bit not being removed must have the same value as the removed ones.

increasing size of data

for unsigned numbers:

all the new bits of the expanded number should be 0 !

for unsigned numbers:

the new bits must be copies of the sign bit.

·the unix shell »显示摘要«

摘要： a shell is a text-based interface between the user and the os, which is a command interpreter that accepts statements (commands) issued by the user through the keyboard, mouse or other devices. a typ......

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