Create 1a.c

Author: fatalcoder524

1a.c

@@ -0,0 +1,21 @@
+%{
+#include<stdio.h>
+int v=0,op=0,id=0,flag=0;
+%}
+%%
+[a-zA-Z]+[0-9A-Za-z]* {id++;printf("\n Identifier:");ECHO;}
+[\+\-\*\/\=] {op++;printf("\n Operartor:");ECHO;}
+"(" {v++;}
+")" {v--;}
+";" {flag=1;}
+.|\n {;}
+%%
+main()
+{
+ printf("Enter the expression");
+ yylex();
+ if((op+1) ==id && v==0 && flag==0)
+ printf("\n Expression is Valid\n");
+ else
+ printf("\n Expression is Invalid\n");
+}