文件名称:cifasaomiaoqi
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设计一个词法扫描器。词法扫描器的功能是输入源程序,输出单词符号。写出关键字集合和程序流程图。例如源程序为C语言。输入如下一段:
main() {
int a,b
a = 10
b = a + 20
}
输出如图:
(2,”main”)
(5,”(“)
(5,”)“)
(5,”{“)
(1,”int”)
(2,”a”)
(5,”,”)
(2,”b”)
(5,” ”)
(2,”a”)
(4,”=”)
(3,”10”)
(5,” ”)
(2,”b”)
(4,”=”)
(2,”a”)
(4,”+”)
(3,”20”)
(5,” ”)
(5,” ) “ )
-Design of a lexical scanner. Function of lexical scanner is an input source and output word symbols. Write keyword collections and program flow diagram. For example, for the C language source code. Enter the following paragraph:
main () (
int a, b
a = 10
b = a+ 20
)
Output shown:
(2, "main")
(5 ,"(")
(5 ,")")
(5 ,"{")
(1, "int")
(2, "a")
(5 ,",")
(2, "b")
(5 ," ")
(2, "a")
(4 ,"=")
(3, "10")
(5 ," ")
(2, "b")
(4 ,"=")
(2, "a")
(4 ,"+")
(3, "20")
(5 ," ")
(5, ")")
main() {
int a,b
a = 10
b = a + 20
}
输出如图:
(2,”main”)
(5,”(“)
(5,”)“)
(5,”{“)
(1,”int”)
(2,”a”)
(5,”,”)
(2,”b”)
(5,” ”)
(2,”a”)
(4,”=”)
(3,”10”)
(5,” ”)
(2,”b”)
(4,”=”)
(2,”a”)
(4,”+”)
(3,”20”)
(5,” ”)
(5,” ) “ )
-Design of a lexical scanner. Function of lexical scanner is an input source and output word symbols. Write keyword collections and program flow diagram. For example, for the C language source code. Enter the following paragraph:
main () (
int a, b
a = 10
b = a+ 20
)
Output shown:
(2, "main")
(5 ,"(")
(5 ,")")
(5 ,"{")
(1, "int")
(2, "a")
(5 ,",")
(2, "b")
(5 ," ")
(2, "a")
(4 ,"=")
(3, "10")
(5 ," ")
(2, "b")
(4 ,"=")
(2, "a")
(4 ,"+")
(3, "20")
(5 ," ")
(5, ")")
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cifasaomiaoqi.cpp