Question

Which of the following is not a valid variable name declaration?( int _3a, int a_3, int_a3, int 3_a)

Answer 1

Answer:

Valid variable name is (1) int _3a (2)int a_3

Explanation:

In c language variable name declaration have some rule

1. Variable name start should be alfabet and _ .

2. Variable name should not be a keyword name .

3. Variable name not contain any special character except _.

Answer 2

The not valid variable declaration as int $3$_a.

Explanation:

Variable:

• In the context of a mathematical problem or experiment, a variable is a quantity that can change.
• A variable is usually represented by a single letter.
• Variables are commonly represented by the letters x, y, and z. We may select a letter that indicates the number it represents, for as t for time, v for voltage, or b for bacteria.