FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Variable name cannot start with a digit.

Detailed explanation-2: -The following are examples of valid variable names: age, gender, x25, age of hh head.

Detailed explanation-3: -A variable is any characteristic, number, or quantity that can be measured or counted. A variable may also be called a data item. Age, sex, business income and expenses, country of birth, capital expenditure, class grades, eye colour and vehicle type are examples of variables.

Detailed explanation-4: -A variable is a way to store values. To use a variable, we must both declare it-to let the program know about the variable-and then assign it-to let the program know what value we are storing in the variable.