Question

1. how do you declare a variable in c++?

Explanation:

In C++, a variable is declared by specifying its data - type followed by the variable name. For example, to declare an integer variable named 'num', you can write 'int num;'. There can also be optional initialization like 'int num = 5;'.

Answer:

In C++, a variable is declared by specifying its data - type followed by the variable name. Optionally, it can be initialized immediately. For example, 'int num;' (declaring an integer variable named 'num') or 'int num = 5;' (declaring and initializing an integer variable 'num' with the value 5).