《Programming from the Ground Up》学习第2天，p19-p48总结，总计30页。
一、技术总结
1.object file
p20, An object file is code that is in the machine's language, but has not been completely put together。
之前在很多地方都看到object file这个概念，但都没有看到起定义，这次终于搞清楚了——object文件就是包含机器语言的文件。
2.汇编语言实现求最大值
#PURPOSE: This program finds the maximum number of a
# set of data items.
#VARIABLES: The registers have the following uses:
#
# %edi - Holds the index of the data item being examined
# %ebx - Largest data item found
# %eax - Current data item
#
# The following memory locations are used:
#
# data_items - contains the item data. A 0 is used
# to terminate the data
#
.section .data
data_items:
.long 3,67,34,222,45,75,54,34,44,33,22,11,66,0
.section .text
.global _start
_start:
movl $0, %edi
movl data_items(,%edi,4),%eax
movl %eax, %ebx
start_loop:
cmpl $0,%eax
je loop_exit
incl %edi
movl data_items(,%edi,4),%eax
cmpl %ebx, %eax
jle start_loop
movl %eax, %ebx
jmp start_loop
loop_exit:
movl $1,%eax
int $0x81
这里作者花了大量的篇幅做解释，但个人觉得在“使用哪种寄存器，为什么使用这种寄存器？”这点上作者没有解释清楚，可能会在后面介绍，先继续往下读。
二、英语总结
1.overwhelm
(1)over-: above, higher in power, above normal...
(2)whelm: turn upside down。
vt. to cause sb to feel strong emotion。
2.diligence
(1)dis-:apart。
(2)*leg-: to collect, gather。
以上两个组合起来的意思是“to pick out, select”， u. the quality of working carefully and with a lot of effort。
3.tinker
vi. to make small change to sth。tinker around with sth和tinker with sth意思一样。
4.process vs processing
A process is a series of steps taken to achieve something, such as the process of making cake.
- Gather ingredients
- Mix ingredients
- Bake
- Decorate cake
Processing is when you do things to a substance in order to change it. For example: the processing of oil into gasoline.
process的意思是“步骤”，processing的意思是“处理”。
三、其它
工作中一位很合得来的同事过完这个月就离职了，有点舍不得。这位同事平时说话温和，情绪稳定，做事沉稳，中正平和，在工作上算得上是一位良好的合作者，祝他未来一切顺遂。
四、参考资料
1. 编程
(1)Jonathan Bartlett，《Programming From The Ground Up》：https://book.douban.com/subject/1787855/
2. 英语
(1)Etymology Dictionary：https://www.etymonline.com
(2) Cambridge Dictionary：https://dictionary.cambridge.org
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