《Programming Abstractions In C》学习第43天,p84-p87总结。
一、技术总结
1.record
record也称为structure(结构体),是一种数据结构。record里面的成员称为record的field。对于record,需要其基本用法:定义、声明、field访问以及其与指针的关系。示例:
c
// 定义structure type语法:
/*
typedef struct {
field-declarations; // structure里面的成员称为field
} name; // structure的名字
*/
// 定义structure
typedef struct {
char *name;
char *title;
char *ssnum;
double salary;
int withholding;
} employeeRecordT;
void main() {
// 声明结构体变量
employeeRecordT empRc;
// record selection: empRc.name;
// 初始化
empRc.name = "Ebenezer Scrooge";
empRc.title = "Partner";
empRc.ssnum = "271-82-8183";
empRc.salary = 250.00;
empRc.withholding = 1;
// 指针与record
employeeRecordT *empPtr;
empPtr = &empRc;
// 指针如何访问record里面的field
// 方式1:
(*empPtr).name; // 注意.的优先级高于*
// 方式2:因为方式1每次都要加括号比较麻烦,所以引入了->操作符
empPtr->name;
}
二、英语总结
1.payroll是什么意思?
答:payroll: pay+ roll:total amount paid to employees over a period(工资名单,发放总额)。roll:常用作动词,但也有名词的用法:a piece of file, paper or cloth that is rolled into the shape of a tube(卷,卷轴)。
2.withholding status什么意思?
答:withhold:tv. to refuse to give back sth,隐瞒、扣留。示例:withhold information(隐瞒信息)
3.firm什么意思?
答:n. a small company(小公司)。
三、参考资料
1.编程
1)Eric S.Roberts,《Programming Abstractions in C》:https://book.douban.com/subject/2003414
2.英语
1)Etymology Dictionary:https://www.etymonline.com
2)Cambridage Dictionary:https://dictionary.cambridge.org
3)Merrian-Webster Dictionary:https://www.merriam-webster.com
4)Collins Dictionary:https://www.collinsdictionary.com
5)Oxford Dictionary:https://www.oxfordlearnersdictionaries.com
6)The Free Dictonary:https://www.thefreedictionary.com
7)Urban Dictionary:https://www.urbandictionary.com
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