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lang-c
std::string(unless there is some pressing need not to!), in C, all except the first approach is possible.malloc(). Read here for reasoning: stackoverflow.com/a/605858/1701799 (basically it's because avoid *will be automatically and safely promoted to the appropriate type). I know this is tagged as C/C++, but there is no such language "C/C++". IF this was C++, you would be using#include <cstdlib>and not#include <stdlib.h>. I think this should probably just be tagged C. In C++, you would pretty much never usemalloc()/free()but instead would usenew/delete, or even better, smart pointers/etc..