Question

What is the output of a lexer for the following invalid C++ code?

x double = 5.0;

Answer 1

The c++ will give us an error, as the syntax of the code x double = 5.0 is wrong.

double will come before x as double is a data type and x is a variable, so it should be -> double x = 5.0

now, if we talk about lexer ->

Lexer tokenizes the stream to turn characters into tokens.

so, x double = 5.0 will be -->

x KEYWORD

double IDENT

= ASSIGN

5.0 DOUBLE

x becomes the keyword here, and double becomes variable, = is assignment operator and 5.0 is double value.