南京大学：《计算机程序的构造和解释 Structure and Interpretation of Computer Programs》课程教学资源（PPT课件讲稿）09-Data-Abstractions

Data Abstraction

Data Abstraction

Announcements

Announcements

Data Abstraction

Data Abstraction

Data Abstraction n

Data Abstraction 4

Data Abstraction Compound values combine other values together d

Data Abstraction • Compound values combine other values together 4

Data Abstraction Compound values combine other values together .A date:a year,a month,and a day m

Data Abstraction • Compound values combine other values together ! A date: a year, a month, and a day 4

Data Abstraction Compound values combine other values together .A date:a year,a month,and a day .A geographic position:latitude and longitude n

Data Abstraction • Compound values combine other values together ! A date: a year, a month, and a day ! A geographic position: latitude and longitude 4

Data Abstraction Compound values combine other values together .A date:a year,a month,and a day .A geographic position:latitude and longitude Data abstraction lets us manipulate compound values as units m

Data Abstraction • Compound values combine other values together ! A date: a year, a month, and a day ! A geographic position: latitude and longitude • Data abstraction lets us manipulate compound values as units 4

Data Abstraction Compound values combine other values together .A date:a year,a month,and a day .A geographic position:latitude and longitude Data abstraction lets us manipulate compound values as units Isolate two parts of any program that uses data: m

Data Abstraction • Compound values combine other values together ! A date: a year, a month, and a day ! A geographic position: latitude and longitude • Data abstraction lets us manipulate compound values as units • Isolate two parts of any program that uses data: 4

Data Abstraction Compound values combine other values together .A date:a year,a month,and a day .A geographic position:latitude and longitude Data abstraction lets us manipulate compound values as units Isolate two parts of any program that uses data: .How data are represented (as parts)

Data Abstraction • Compound values combine other values together ! A date: a year, a month, and a day ! A geographic position: latitude and longitude • Data abstraction lets us manipulate compound values as units • Isolate two parts of any program that uses data: ! How data are represented (as parts) 4