![]() ![]() Stack overflow happens when all the memory in the stack has been allocated, and further allocations begin overflowing into other sections of memory. If a program tries to put too much information on the stack, stack overflow will occur. Note that there is generally a limit on the size of the stack. Then when a function finishes running, all the variables associated with that function on the stack are deleted, and the memory they use is freed up. Every time a function declares a new variable it is “pushed” onto the stack. It’s a LIFO, “Last-In,-First-Out”, structure. Whereas heap is slow and is managed by the garbage collector or the programmer. The stack is used to store variables used on the inside of a function (including the main() function). Stack has high access speed and the space is managed by the operating system. ![]() For example, the same variable created inside a function using the static clause would allow it to be stored in static memory. ![]() It is also possible to force a variable to be static using the static clause. A fixed amount of memory is allocated at compile time with the static allocation (Stack Memory). In dynamic allocation (Heap Memory), memory is allocated at the program run time. Memory allocation can be dynamic or static. Inside a function the variable is allocated on the stack. Computer programs require a certain amount of memory to be allocated for execution. The major difference between Stack memory and heap memory is that the stack is used to store the order of method execution and local variables while the heap. Static memory persists throughout the entire life of the program, and is usually used to store things like global variables, or variables created with the static clause. Global variables are static, and there is only one copy for the entire program. ![]()
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