LEX program to check whether a expression is valid or not a 23:37 Add Comment a %{ #include<stdio.h> int a=0,b=0,c=0,d=0,ob=0,cb=0; int flaga=0,flagb=0,flagc=0,flagd=0; %} %% [a-zA-z]+ printf("\n %s is an ide... Read More