fixed output of numeric output from expr().

Operand.cpp

@@ -64,6 +64,11 @@ namespace jet {
 	    Operand op(parm1.string, tag);
 	    string = op.string;
 	    isNumber = op.isNumber;
+	    if(isNumber) {		 
+	       doubleValue = op.doubleValue;
+	       string = std::format("{:.12f}", doubleValue);
+	       string.removeTrailingZeros();	 	       
+	    }	    
 	    boolean = op.boolean;	    
 	 } else
 	   throw coreutils::Exception("Expecting ) at end of EXPR expression.");