Help with dividing fractions

Hello,
I have been trying to write a program that takes two fractions entered by the user and divides them. This is the code I have but unfortunatly even with a simple division of 1/2 by 1/2 gives me 1232938213982139. Something is not right and I cannot figure it out. Any suggestions would be great.

Code:

#include <cstdlib>
#include <iostream>
#include <cmath>

using namespace std;                                              

int main(int argc, char *argv[])
{
 int num1;                                                         
 int den1;                                                         
 int num2;                                                          
 int den2;                                                          
 int fnlnum;                                                        
 int fnlden;                                                       

 void divideFractions(int num1, int num2, int den1, int den2);                                                     

 {
     fnlnum= num1 * den2;                                           
     fnlden= den1 * num2;                                           
}
 
 {
  
  cout << "Dividing Fractions Calculator" << endl;                 
 
  cout << "Please enter your first numerator:" << endl;             
 
  cin >> num1;                                                     
 
  cout << "Please enter your first denominator:" << endl;           
 
  cin >> den1;                                                      
 
  cout << "Please enter your second numerator:" << endl;           
      
  cin >> num2;                                                     
 
  cout << "Please enter your second denominator:" << endl;          
   
  cin >> den2;                                                     
 
  cout << num1 << "/" << den1 << " divided by " << num2             
       << "/" << den2 << "=" << fnlnum << "/" << fnlden << endl;


if (den1 == 0 || den2 == 0)
{
  cout << "You must enter a number other than 0" << endl;

}

}
    system("PAUSE");
    return EXIT_SUCCESS;
}

Originally Posted by limburger

Hello,
I have been trying to write a program that takes two fractions entered by the user and divides them. This is the code I have but unfortunatly even with a simple division of 1/2 by 1/2 gives me 1232938213982139. Something is not right and I cannot figure it out. Any suggestions would be great.

Code:

#include <cstdlib>
#include <iostream>
#include <cmath>

using namespace std;                                              

int main(int argc, char *argv[])
{
 int num1;                                                         
 int den1;                                                         
 int num2;                                                          
 int den2;                                                          
 int fnlnum;                                                        
 int fnlden;                                                       

 void divideFractions(int num1, int num2, int den1, int den2);                                                     

 {
     fnlnum= num1 * den2;                                           
     fnlden= den1 * num2;                                           
}
 
 {
  
  cout << "Dividing Fractions Calculator" << endl;                 
 
  cout << "Please enter your first numerator:" << endl;             
 
  cin >> num1;                                                     
 
  cout << "Please enter your first denominator:" << endl;           
 
  cin >> den1;                                                      
 
  cout << "Please enter your second numerator:" << endl;           
      
  cin >> num2;                                                     
 
  cout << "Please enter your second denominator:" << endl;          
   
  cin >> den2;                                                     
 
  cout << num1 << "/" << den1 << " divided by " << num2             
       << "/" << den2 << "=" << fnlnum << "/" << fnlden << endl;


if (den1 == 0 || den2 == 0)
{
  cout << "You must enter a number other than 0" << endl;

}

}
    system("PAUSE");
    return EXIT_SUCCESS;
}

You never initialise or set "fnlden" or "fnlnum" because you never call "divideFractions()". Not sure why you want "divideFractions()" at local scope, that's a poor way to do it. Just remove the funciton, and do the calculation yourself for now. That is, "fnlnum= num1 * den2;", etc. After you have read num1, num2, den1 and den2.
You also have a few extra brackets, and extra semi-colon (highlighted above).

Thanks that helped a lot. I have only been doing this for a couple weeks now and I am slowly learning.