Web Reference: Oct 7, 2025 · Their size is determined when execution reaches the declaration. They must be declared inside a function (block scope) or in a function prototype scope, not globally. Oct 3, 2017 · int a[size] is a variable length array - which is not a part of standard C++. You should use std::vector. Technically you can't. An array size must be known at compile time. Some compilers offer an extension that allows Variable Length Arrays, but once you set the size, the size is fixed. A variable length array in C is also called a variable-sized or runtime-sized array. It is an array whose length is determined at the runtime rather than at the time of compiling the program.
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