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📜  Lex程序可计算行,空格和制表符的数量

📅  最后修改于: 2021-06-28 07:23:57             🧑  作者: Mango

Lex是一个生成词法分析器的计算机程序,由Mike Lesk和Eric Schmidt编写。 Lex读取指定词法分析器的输入流,并输出以C编程语言实现词法分析器的源代码。
让我们看看如何使用Lex计算行,空格和制表符的数量。
例子:

Input:
Geeks for       Geeks 
gfg  gfg

Output:
No. of lines=2 
No. of spaces=3 
No. of tabs=1 
No. of other characters=19

Input:
Hello
How    are    you?

Output:
No. of lines=2 
No. of spaces=4 
No. of tabs=1 
No. of other characters=15

下面是实现:

C
/*lex code to count the number of lines,
    tabs and spaces used in the input*/
 
%{
#include
int lc=0, sc=0, tc=0, ch=0; /*Global variables*/
%}
 
/*Rule Section*/
%%
\n lc++; //line counter
([ ])+ sc++; //space counter
\t tc++; //tab counter
. ch++;     //characters counter
%%
 
int main()
{
    // The function that starts the analysis
    yylex();
     
    printf("\nNo. of lines=%d", lc); 
    printf("\nNo. of spaces=%d", sc);
    printf("\nNo. of tabs=%d", tc);
    printf("\nNo. of other characters=%d", ch);
     
}


输出:

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