Which of the following variable names is not valid? 1price 1 price price 1 price1

1price 1 price price 1

Explanation:

In the c programming, the rule for valid variable name.

1. Variable name cannot start with numeric value like 1,2,3..

2. Space and special character other than underscore '_' are not allowed.

3. After the first letter, numeric values can be used.

Let discuss the options:

Option A:  1price

it start with number which is not allowed.

Option B:  1 price

it start with number and also contain the space which is not allowed.

Option C:  price 1

it contain the space which is not allowed.

Option D:  price1

it is the valid variable name, start with letter and their is no space.

Therefore, option A, B and C are correct option.

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