高级程序设计语言 Programming language abstractions fall into two general categories: data abstraction and control abstraction. Data abstractions simplify for human users the behavior and attributes of data,such as numbers,character strings,and search trees. Control abstractions simplify properties of the transfer of control,that is,the modification of the execution path of a program based on the situation at hand.Examples of control abstractions are loops,conditional statements,and procedure calls. int first =5; int second =6; int sum first second;高级程序设计语言 • Programming language abstractions fall into two general categories: data abstraction and control abstraction. • Data abstractions simplify for human users the behavior and attributes of data, such as numbers, character strings, and search trees. • Control abstractions simplify properties of the transfer of control, that is, the modification of the execution path of a program based on the situation at hand. Examples of control abstractions are loops, conditional statements, and procedure calls