https://oj.leetcode.com/problems/evaluate-reverse-polish-notation/

Evaluate Reverse Polish Notation.cpp

#define GET_TWO_OPERANDS { \
 y = operands.top(); operands.pop(); \
 x = operands.top(); operands.pop(); }

class Solution {
public:
	int evalRPN(vector<string> &tokens)
	{
		stack<int> operands;

		for (int i = 0; i < tokens.size(); ++i) {
			string &token = tokens[i];

			if (token == "+") {
				int x; int y;
				GET_TWO_OPERANDS;
				operands.push(x + y);
			}
			else if (token == "-") {
				int x; int y;
				GET_TWO_OPERANDS;
				operands.push(x - y);
			}
			else if (token == "*") {
				int x; int y;
				GET_TWO_OPERANDS;
				operands.push(x * y);
			}
			else if (token == "/") {
				int x; int y;
				GET_TWO_OPERANDS;
				operands.push(x / y);
			}
			else {
				int x;
				sscanf(token.c_str(), "%d", &x);
				operands.push(x);
			}
		}

		return operands.top();
	}
};

hi, can you tell how the sscanf is working!