Before a variable is used it must be: begin with a capitol letter contain only letters, digits, and underscores initialized used in an expression defined Question 4 Which of the following types are not built into the C + + language bool char int float .

1. Before a variable is used it must be: begin with a capitol letter contain only letters, digits, and
underscores initialized used in an expression defined Question 4 Which of the following types
are not built into the C + + language bool char int float