What's the Difference Between `(type)value` and `type(value)` in C ?

Understanding the Difference Between (type)value and type(value) in C

In C , the syntax of (type)value and type(value) may appear similar, but they can behave differently. Let's delve into the nuances of these two expressions.

As per the C standard (§5.2.3), there is no inherent difference between (type)value and type(value) when used with a single expression. They both convert the expression to the specified type.

However, when dealing with a comma-separated list of values, the expressions behave differently. type(x1, x2, ...) is equivalent to declaring a temporary variable of type T and initializing it with the provided values, while (type)value(x1, x2, ...) is not valid syntax.

Moreover, certain type names may not allow the type(value) form, as pointed out by Troubadour. For instance, while (char )string compiles, char (string) does not. However, using a type alias can resolve this issue, as demonstrated by the example provided in the original question.

Therefore, while (type)value and type(value) may be equivalent for single expressions, they exhibit different behavior when dealing with lists of values and certain type names. Understanding these nuances is crucial for effective C programming.

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