Counting Vowels and Consonants LEX Program

Compiler Construction Lab Manual / Counting Vowels and Consonants LEX Program

Program Name

Write a Compiler Construction Program for Counting Vowels and Consonants LEX Program.

Theory
//Vi file.c Hello World

Program Code


%{
#include<stdio.h>
int vowels;
int cons;
char n;
%}
%%
[a|e|i|o|u|A|E|I|O|U] {vowels++;}
[a-zA-Z] {cons++;}
%%
int main(int argc,char *argv[])
{
yyin=fopen(argv[1],"r");
yylex();
printf("no of vowels=%d\n no of constants=%d\n",vowels,cons);
fclose(yyin);
return 0;
}
int yywrap(void){	return 1;	}

Saving: vi voww.l

Compiling and Running
lex voww.l
cc lex.yy.c
./a.out file.c

Input

Output
no of vowels=3 no of constants=7

Home Back