In C any expression can be tested within a selection statement, be it a relational, arithmetic, or assignment expression, or even a function call.

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In C, any expression that evaluates to a non-zero value is considered true, and zero is considered false. Therefore, any type of expression, including relational, arithmetic, assignment expressions, or function calls that return a value, can be used in a selection statement (e.g., if, while) to control the flow of the program based on its truth value.

In C Any Expression Can Be Tested Within a Selection