When I allocate memory on the heap with malloc(), there might be garbage in that memory unless I use calloc() or memset() to zero it out. Is this the same situation for the stack, or can I safely assume anything I allocate on the stack won't have garbage in it? Also, does this differ on different systems or OSes?

CodePudding user response：

It is the same situation on the stack.

Unless you explicitly initialize the values of variables to zero or some other value, variables with automatic storage duration will have indeterminate values.