Hier der Code:

#include <iostream>
#include <cmath>
using namespace std;

double addNumbers(double x, double y);
double subNumbers(double x, double y);
double mulNumbers(double x, double y);
double divNumbers(double x, double y);

int main()
{
double numA;
double numB;
double result;
int choice;

do
{

cout << "Hello, please give me two numbers!" << endl;
cout << "Number a: " << endl;
cin >> numA;
cout << endl;

cout << "Number b: " << endl;
cin >> numB;
cout << endl;

cout << "What shall I do with them?" << endl;
cout << endl;
cout << "(1) addition" << endl;
cout << "(2) subtraction" << endl;
cout << "(3) multiplication" << endl;
cout << "(4) division" << endl;
cout << "(5) Exit" << endl;

cin >> choice;

if (choice == 1)
{
cout << addNumbers(numA, numB) << endl;
}

else if (choice == 2)
{
cout << subNumbers(numA, numB) << endl;
}

else if (choice == 3)
{
cout << mulNumbers(numA, numB) << endl;
}

else if (choice == 4)
{
cout << divNumbers(numA, numB) << endl;
}

}
while (choice != 5);

system ("PAUSE");
return 0;
}

double addNumbers(double x, double y){
double answer = x + y;
cout << "The result is " << answer << endl;
return answer;
}

double subNumbers(double x, double y){
double answer = x - y;
cout << "The result is " << answer << endl;
return answer;
}

double mulNumbers(double x, double y){
double answer = x * y;
cout << "The result is " << answer << endl;
return answer;
}

double divNumbers(double x, double y){
double answer = x / y;
cout << "The result is " << answer << endl;
return answer;
}

Ist vermutlich eine simple Sache aber ich komme gerade echt nicht auf die Loesung. Danke schon mal fuer jede Hilfe!

xwarhoundx

Tipp: Die erste Möglichkeit ist wesentlich sauberer, da die Aufgaben klarer logisch getrennt sind.