Create Compiler.l

Author: Pratheeba21

Compiler.l

@@ -0,0 +1,27 @@
+%{
+#include <stdio.h>
+%}
+
+DIGIT       [0-9]
+NUMBER      {DIGIT}+
+IDENTIFIER  [a-zA-Z_][a-zA-Z0-9_]*
+OPERATOR    "+"|"-"|"*"|"/"
+LPAREN      "("
+RPAREN      ")"
+WS          [ \t\n]
+
+%%
+{NUMBER}    { printf("NUMBER(%s)\n", yytext); }
+{IDENTIFIER}{ printf("IDENTIFIER(%s)\n", yytext); }
+{OPERATOR}  { printf("OPERATOR(%s)\n", yytext); }
+{LPAREN}    { printf("LPAREN\n"); }
+{RPAREN}    { printf("RPAREN\n"); }
+{WS}        { /* Ignore whitespace */ }
+.           { printf("UNKNOWN(%s)\n", yytext); }
+
+%%
+
+int main() {
+    yylex();
+    return 0;
+}