#include <iostream>
int main()
{
double lhs = 0, rhs;
char operand;
std::cin >> lhs;
while (std::cin >> operand >> rhs)
{
switch(operand)
{
case '+': lhs += rhs; break;
case '-': lhs -= rhs; break;
case '*': lhs *= rhs; break;
case '/': lhs /= rhs; break;
}
std::cout << "Zwischenergebnis: " << lhs << '\n';
}
}
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