Which of the following are not a valid variable name declaration? a) float f; b) int 2a; c) int an_age; d) float for;

July 1, 2026Computer Science

ScanSolve AI Answer

July 1, 2026

The invalid variable name declarations are b) int 2a; and d) float for;.

Here's why:

b) int 2a; is invalid because variable names in C cannot start with a digit. They must start with a letter or an underscore.
d) float for; is invalid because for is a reserved keyword in C (used for loops) and cannot be used as a variable name.

a) float f; is valid. c) int an_age; is valid.

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The invalid variable name declarations are b) int 2a; and d) float for;. Here's why: b) int 2a; is invalid because variable names in C cannot start with a digit.

Asked on July 1, 2026Computer Science

This computer science problem involves algorithmic thinking and programming concepts. The solution below explains the approach, logic, and implementation step by step.

ScanSolve AI AnswerAnswered on July 1, 2026

The invalid variable name declarations are b) int 2a; and d) float for;. Here's why: b) int 2a; is invalid because variable names in C cannot start with a digit. They must start with a letter or an underscore. d) float for; is invalid because for is a reserved keyword in C (used for loops) and cannot be used as a variable name. a) float f; is valid. c) int an_age; is valid. Got more? Send 'em.