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Push inserts a value onto the top of the stack.

Pop extracts the top value from the stack.

These are the two primary operations that can be performed upon a stack. Prior to popping a value, you will first check the stack is not empty, store the top value, then pop the stack. For a stack of type T, you might use the following:

if (!stack.empty()) {

T value {stack.top()}; // copy top value

stack.pop(); // remove value from stack

// use value...

}

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