Lex Program TO find Syntax of Printf()

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Lex Program TO find Syntax of Printf()


Source Code:-

 



1:  %{  

2:  #include<stdio.h>  
3:  #include<ctype.h>  
4:  int i=0,j=0;  
5:  %}  
6:  a "%d"|"%f"|"%c"|"%s"  
7:  id [a-zA-Z][a-zA-Z0-9]*  
8:  %%  
9:  printf\((\"({a}*|.*)*\"(,{id})*\))\; {for(i=0;i<yyleng;i++){if(yytext[i]=='%')  
10:  j++;  
11:  if(yytext[i]==',')  
12:  j--;  
13:  }  
14:  if(j==0)  
15:  printf("\ncorrect");   
16:  else   
17:  printf("incorrect");  
18:  }  
19:  %%  
20:  main()  
21:  { yyin=fopen("file12.c","r");  
22:  yylex();  
23:  }  
24:  int yywrap()  
25:  {return 1;  
26:  }                    

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