i have to create a stack in mat lab and the stack is called S .i have to declare S as global variable in the main function and from the main function i have to call push and pop. can anyone give me a...

i have to create a stack in mat lab and the stack is called S .i have to declare S as global variable in the main function and from the main function i have to call push and pop. can anyone give me a simple example of global variable in C or mat lab so i can implement it in stacks