#include "RPN.hpp"

static double do_op(double num1, char c, double num2)

{

if (c == '+')

return (num1 + num2);

if (c == '-')

return (num1 - num2);

if (c == '*')

return (num1 * num2);

if (c == '/')

return (num1 / num2);

return(0);

}

void RPN::solve(std::string input)

{

std::stack<double> stack;

double num1, num2;

for (size_t i = 0; i < input.length(); i++)

{

if (input[i] >= '0' && input[i] <= '9')

stack.push(input[i] - '0');

else if ((input[i] == '+' || input[i] == '-' || input[i] == '*' || input[i] == '/') && stack.size() > 1)

{

num2 = stack.top();

stack.pop();

num1 = stack.top();

stack.pop();

stack.push(do_op(num1, input[i], num2));

}

else if (std::isspace(input[i]))

continue;

else

throw std::exception();

}

std::cout << stack.top() << std::endl;

}