c语言实现编译原理词法分析器

词法分析器

C语言实现编译原理中的词法分析器源代码下载

text.txt文件内容:

char word[10];
		char pro[100][100] = { "PROGRAM", 

"BEGIN", "END", "VAR", "INTEGER", "WHILE", "IF", "THEN", 

"ELSE", "DO", "PROCEDURE" ,
								

"char","int","if","else","var" 

,"return","break","do","while","for","double","float","sh

ort"}; //保留字表

		int n = 0;
		word[n++] = a[i++];
		//若字符为A~Z或0~9,则继续读取
		while ((a[i] >= 'A'&&a[i] <= 'Z') || (a

[i] >= '0' && a[i] <= '9')||(a[i]>='a'&&a[i]<='z'))
		{
			word[n++] = a[i++];
		}
		word[n] = '\0';
		i--;

执行结果:

c语言实现编译原理词法分析器_第1张图片
c语言实现编译原理词法分析器_第2张图片
C语言实现编译原理中的词法分析器源代码下载

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