Hey i have no clue what to put in the ReduceFration and CommonDemoninator sections.

I know that you call the gcd function for ReduceFration and lcm function for CommonDenominator.

Should be easy few lines of code but I'm a Beginner!

Here's the code:

```
#include <iostream>
using namespace std;
int gcd(int x,int y)
{
int t;
t = x % y;
while (t != 0)
{
x = y;
y = t;
t = x % y;
}
return y;
}
int lcm(int x,int y)
{
int ans, cnt;
if (x > y)
{
cnt = x;
}
else
{
cnt = y;
}
ans = 0;
while (ans == 0)
{
if (cnt % x == 0 && cnt % y == 0)
{
ans = cnt;
}
else
{
cnt++;
}
}
return ans;
}
void ReduceFraction(int &num,int &den)
{
// Missing function goes here!
}
void CommonDenominator(int &num1, int &den1, int &num2, int &den2)
{
// Missing function goes here!
}
void main()
{
int num1, den1, num2, den2, newnum, newden;
char slash1, slash2, op;
cout << "\nFraction Calculator\n\n";
cout << "Add, subtract, multiply & divide - positive fractions only\n";
cout << "Enter '0/0 + 0/0' to quit.\n";
// Input will be assumed to be in correct form for simplification
// Input data before loop in case they want to exit right away
cout << "\n> ";
cin >> num1 >> slash1 >> den1 >> op >> num2 >> slash2 >> den2;
while (num1 + den1 + num2 + den2 > 0)
{
// Reduce both fractions to keep integers as small as possible
ReduceFraction(num1, den1);
ReduceFraction(num2, den2);
switch (op)
{
case '+':
// Find common denominator and add
CommonDenominator(num1,den1,num2,den2);
newnum = num1 + num2;
newden = den1;
break;
case '-':
// Find common denominator and subtract
CommonDenominator(num1,den1,num2,den2);
newnum = num1 - num2;
newden = den1;
break;
case '*':
// Multiply numerators and multiply denominators
newnum = num1 * num2;
newden = den1 * den2;
break;
case '/':
// Invert and multiply
newnum = num1 * den2;
newden = den1 * num2;
}
// Reduce the answer to lowest terms
ReduceFraction(newnum, newden);
// Output the results
cout << num1 << "/" << den1 << " " << op << " ";
cout << num2 << "/" << den2 << " = ";
cout << newnum << "/" << newden << endl;
// Input data for next iteration of loop
cout << "\n> ";
cin >> num1 >> slash1 >> den1 >> op >> num2 >> slash2 >> den2;
}
}
```