import java.io.*;
import antlr.CommonAST;
import antlr.collections.AST;
import antlr.DumpASTVisitor;
import antlr.RecognitionException;
import antlr.TokenStreamException;
class Calc {
public static void main(String[] args) {
try {
CalcLexer lexer = new CalcLexer(new DataInputStream(System.in));
lexer.setFilename("<stdin>");
CalcParser parser = new CalcParser(lexer);
parser.setFilename("<stdin>");
// Parse the input expression
parser.expr();
CommonAST t = (CommonAST)parser.getAST();
// Print the resulting tree out in LISP notation
System.out.println(t.toStringTree());
CalcTreeWalker walker = new CalcTreeWalker();
// Traverse the tree created by the parser
float r = walker.expr(t);
System.out.println("value is "+r);
}
catch(TokenStreamException e) {
System.err.println("exception: "+e);
}
catch(RecognitionException e) {
System.err.println("exception: "+e);
}
}
}