Variable Length Arrays C99

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In computer programming , a variable-length array ( VLA ), also called variable-sized , runtime-sized , is an array data structure whose length is determined at run time (instead of at compile time). [1] In C, the VLA is said to have a variably modified type that depends on a value (see Dependent type ).

Variable-length automatic arrays are allowed in ISO C99, and as an extension GCC accepts them in C90 mode and in C++. These arrays are declared like any other automatic arrays, but with a length that is not a constant expression. The storage is allocated at the point of declaration and deallocated when the block scope containing the declaration exits. For example:

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