Factorial program using function in C++

factorialUsingFunction.cpp

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+# include<iostream>
+using namespace std;
+class number {
+private:
+    int n;//so that number variable can only be initialized from the constructor
+public:
+    number(int num) {
+        n = num;//Initializing the number for which the factorial is being calculated
+    }
+    int factorial() {
+        int i, fac = 1;//i is for running the loop and fac is the factorial
+        for(int i = 1; i <= n; i++) {
+            fac = fac * i;
+        }
+        return fac;
+    }
+};
+int main() {
+    int k = 1;
+    while(k == 1) {
+        int num;
+        cout<<"The number for which you wish to calculate the factorial"<<endl;
+        cin>>num;
+        number obj(num);//Making an object of number class
+        cout<<"Factorial of "<<num<<" is "<<obj.factorial()<<endl;//for printing the factorial
+        cout<<"If you wish to calculate of some other number press 1 else press any other number."<<endl;
+        cin>>k;
+    }
+    return 0;
+}