Ccpp Memory — Free C Cpp Tutorial
Learn Ccpp Memory in C Cpp with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
TL;DR: Learn Ccpp Memory in C Cpp with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
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Ccpp Memory in C Cpp
So far arrays had a fixed size known at compile time. When the size is only known at run time (e.g. the user says how many numbers), you allocate memory on the heap with malloc, which returns a pointer to a block of the requested bytes. `int *a = malloc(n * sizeof(int));` gives you an array of n ints.
Heap memory is NOT freed automatically. Every malloc must be matched by exactly one free(a) when you are done, or the program leaks memory — a serious bug in long-running software. Freeing twice, or using memory after freeing it, is undefined behaviour.
Always check whether malloc returned NULL (allocation can fail), and set a pointer to NULL after freeing so you never accidentally reuse it. In C++ the equivalents are `new` / `delete`, but modern C++ prefers containers like std::vector that manage memory for you.
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