I'm having problems looping a function - c++

Question

funtion
I have been trying too loop the "1 + 1/3 + 1/5 + ... + 1/n" part in the screenshot inside my code but could not do it all.
The compiler calculates 'x' which is the factorial correctly the only problem for me now is looping the fractions in the function.
int main()
{
int i=1,n,x=1; //x : factorial
double f;
cout<<"Enter an odd number : "<<endl;
cin>>n;
if (n%2==0)
{
cout<<"You have to enter an odd number."<<endl;
}
else
{
while(i<=n)
{
x = x * i;
f = x*(1+(1.0/n)) ;
i+=1;
}
}
cout<<"f = "<<f<<endl;}

Answer 1

Here is your answer
#include <iostream>
using namespace std;
int main()
{
int n;
double f = 1;
cout<<"Enter an odd number : "<<endl;
cin >> n;
if ( n%2 == 1)
{
double temp = n;
while ( temp > 1 ) // this one calculates factorial,
{
f *= temp;
temp--;
} // f = n!
temp = 1;
double result = 0;
while ( temp <= n ) // this one calculates (1 + 1/3 + ... + 1/n)
{
result += ( 1 / temp );
temp += 2;
} // result = (1 + 1/3 + ... + 1/n)
f = f * result; // f = n! * (1 + 1/3 + ... + 1/n)
cout<<"f = "<<f<<endl;
}
else
cout<<"You have to enter an odd number."<<endl;
return 0;
}
You need to operate on the same types of data ;)

Answer 2

Hey I have Modified your code, you can run it and can match your Result with Calulator
#include <iostream>
#include <math.h>
using namespace std;
int odnumber(int num);
int calFactorial(int num);
int main() {
int oddNumber, i = 1;
float temp=0, temp2 = 0, f = 0.0;
do
{
cout << "Enter the Odd Number: " << endl;
cin >> oddNumber;
} while (oddNumber%2 == 0);
while (i <= oddNumber)
{
if (odnumber(i))
{
temp = (double)(1.0/i);
temp2 +=temp;
}
i++;
}
f = calFactorial(oddNumber)*temp2;
cout << "F is = " << f << endl;
return 0;
}
int odnumber(int num) {
if (num % 2 != 0)
{
return 1;
}
else
{
return 0;
}
}
int calFactorial(int num) {
int x = 1, i = 1; //x is Factorial
while (i <= num)
{
x = x * i;
i++;
}
return x;
}
This is the Output: Run on my Machine