#include
int foo(int l, int r, char op)
{
switch (op)
{
case '-': return l - r;
case '+': return l + r;
case '/': return l / r;
default: return l * r;
}
}
int main()
{
int a, b; char op;
std::cin >> a >> op >> b;
std::cout
#include
using namespace std;
int main() {
auto add = [](double a, double b) { return a + b; };
auto sub = [](double a, double b) { return a - b; };
auto mul = [](double a, double b) { return a * b; };
auto div = [](double a, double b) { return a / b; };
char op;
double a, b, res;
bool flag;
while (true) {
flag = true;
cout > op >> a >> b;
cout + 3 8