编译器和解释器是两种高级语言处理程序,与编译器相比,(29)。编译器对高级语言源程序的处理过程可以划分为问法分析、语法分析、语义分析、中间代码生成、代码优化、目标代码生成等几个阶段:其中,代码优化和(30)并不是每种编译器都必需的。词法分析的作用是识别源程序中的(31);语法分析中的预测分析法是(32)的一种语法分析方法;编译器在(33)阶段进行表达式的类型检查及类型转换。
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(127)
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An instruction is made up of operations that(68)the function to be performed and operands that represent the data to be operated on. For example, if an instruction is to perform. the operation of(69)two numbers, it must know(70)the two numbers are. The processor's job is to(71)instructions and operands from memory and to perform. each operation. Having done that, it signals memory to send it(72)instruction.
(124)
A firewall is a(71)system designed to(72)an organization's network against threats.
(122)
在常用的字处理软件中,选中文本块后,按下Ctrl键再拖曳鼠标,可以()
There are many page replacement algorithms in the page management. Most frequently used algorithm is(69).
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