Write a C++ program that reads a number and determines whether the number is positive, negative or zero using Switch operator method

#include <iostream>

using namespace std;

template <typename T> int sgn(T val) {

   return (T(0) < val) - (val < T(0));

}

int main()

{

   cout << "Enter a number: ";

   int number;

   cin >> number;

   switch (sgn(number)) {

   case -1: cout << "The number is negative";

       break;

   case 0: cout << "The number is zero";

       break;

   case 1: cout << "The number is positive";

       break;

   }

}

Explanation:

You need the special sgn() function because a switch() statement can only choose from a list of discrete values (cases).