How to Efficiently Initialize Integer Arrays Using the `new` Operator in C ?

Initialising Memory with the New Operator in C

For beginners embarking on the C journey, establishing sound programming practices is crucial. When allocating an array of type int using the new operator, there is a cleaner and more efficient way to initialise all elements to 0 than manually looping through them.

The "C Way" of Initialisation

Surprisingly, C provides specific syntax for value-initialising arrays:

new int[10]();

The empty parentheses are essential, as other initialisation methods (e.g., (0)) are not permissible.

This approach is explicitly permitted by the ISO C 03 standard, which states that the new-expression with the form () invokes value-initialisation for the allocated object.

Why Use Value-Initialisation?

Value-initialisation offers several advantages:

• It eliminates the need for a loop, saving time and reducing the chance of errors.
• It ensures a consistent initial state for all array elements.
• It is a more concise and readable code compared to using memset or other methods.

Limitations

It's important to note that this initialisation method is only applicable to types that can be value-initialised. For non-trivial types that require custom initialisation, it is still necessary to resort to explicit assignments or other initialisation techniques.

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