Switches in C++ - c++

Question

I am new to C++ and programming in general and was trying to figure out a way to create a switch in C++ to trigger when a number entered is divisible by 3, by 5, and by both 3 and 5. Here is what I have so far:
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
int number;
cout << "Please input a number and then press the enter key" << endl;
cin >> number;
switch (number){
case "/3":
cout << "Fizz" << endl;
break;
case "/5":
cout << "Buzz" << endl;
break;
case "/3" "/5":
cout << "FizzBuzz" << endl;
break;
default:
cout << "Please select another number." << endl;
}
}
Any help with this would be greatly appreciated! :)

Answer 1

In C++ the switch labels must be compile-time evaluable constant expressions that are integral types.
"/3", for example, is a string literal and so does not fit that requirement.
In this case, use number % 3 == 0 to test for divisibility by 3, and so on and use an if, else block:
if (number % 15 == 0){
/*FizzBuzz - do this one first as my `if` block is not mutually exclusive*/
} else if (number % 3 == 0){
/*Fizz*/
} else if (number % 5 == 0){
/*Buzz*/
}

Answer 2

You can use if else.
int remainder1 = 0, remainder2 = 0;
remainder1 = number % 3;
remainder2 = number % 5;
if(remainder1 == 0 && remainder2 ==0) // both
cout<<"FizzBuzz"<<'\n';
else if(remainder1 == 0) // number can be divided by 3
cout<<"Fizz"<<'\n';
else if(remainder2 == 0) // number can be divided by 5
cout<<"Buzz\n";
else // neither
cout<<"......"<<'\n';
BTW, you do have to read the basic book about C++.
here, you can know more about switch

Answer 3

If you really want to do with switch, here is a method, but is not nice. The easiest way is how Bathsheba said.
#include <iostream>
#include <cmath>
using namespace std;
enum class divided { DivideBy3 , DivideBy5 , DivideBy3and5 }; // "strong enum"
// enum class divided { DivideBy3 , DivideBy5 , DivideBy3and5 }; //also good but can be unsafe
divided getCase(int number)
{
divided div;
if(number%3 == 0)
div = divided::DivideBy3;
if(number%5 == 0)
div = divided::DivideBy5;
if(number%3 ==0 && number%5 == 0)
div = divided::DivideBy3and5;
return div;
}
int main()
{
int numberIn;
cout << "Please input a number and then press the enter key" << endl;
cin >> numberIn;
divided number = getCase(numberIn);
switch (number)
{
case divided::DivideBy3:
cout << "Fizz" << endl;
break;
case divided::DivideBy5:
cout << "Buzz" << endl;
break;
case divided::DivideBy3and5:
cout << "FizzBuzz" << endl;
break;
default:
cout << "Please select another number." << endl;
}
}
look at this for enum vs class enum. Keep going.