Rank: ? (2)
Member #: 9816

I am trying to write a program to perform basic math operations on fractions. I have been able to figure out how to multiply and divide, but I am stumped on how to make it add and subtract, since the fractions have to be multiplied to a common denominator. Here is what i have so far:

#include<conio.h>
#include<iostream>
using namespace std;

int main()

{
int i1, i2, i3, i4;
char c, op;

cout<<"Please enter a fraction using #/#, the operation (+, -, *, /) you wish \nto be performed, and the second fraction, seperating the fractions \nand operator with a space."<<endl;

cin>>i1;
cin.get(c);
cin>>i2;
cin.get(c);
cin.get(op);
cin.get(c);
cin>>i3;
cin.get(c);
cin>>i4;

if (op = '*')
cout<<"The answer is "<<i1 * i3<<"/"<<i2 * i4<<endl;




return 0;
}

If anyone could help me i would appreciate it. I need a response as fast as possible, so my Email is Blitz07734@yahoo.com and my AIM SN is blitz07735.

Thanks,
John

Rank: ? (4827)
Member #: 3416

if you don't need the *lowest* common denominator, you can always find a common denominator this way:

n1/d1 + n2/d2 = (n1/d1) * (d2/d2) + (n2/d2) * (d1/d1)

you will have d1 * d2 as your denominator for both fractions that you want to add together.