Counting Identifiers LEX Program

Compiler Construction Lab Manual / Counting Identifiers LEX Program

Program Name

Write a Compiler Construction Program for Counting Identifiers LEX Program.

Theory
Counting Identifiers LEX Program

Program Code


%{
int count;
%}
digit [0-9]
letter [A-Za-z]
%%
{letter}({letter}|{digit})* count++;
%%
int main (int argc,char *argv[])
{
yyin=fopen(argv[1],"r");
yylex();
printf("\n the no of identifierare:%d",count);
fclose(yyin);
}
int yywrap(void){	return 1;	}

Saving: vi countingidentifiers.l

Compiling and Running
lex countingidentifiers.l
cc lex.yy.c
./a.out a.txt

Input
Create a text file a.txt and enter data. Vi a.txt Prasad created this file1234 a1234

Output
the no of identifierare:5

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