Question

I wrote a program to multiply, divide, add, and subtract fractions..I just can’t figure out what the formula would be to add and subtract them. What would It be?

my code so far:

   Fraction subtractFractions(Fraction numDen, Fraction numDen2)
{
Fraction value;
value.numerator=numDen.numerator-numDen2.numerator;
if(numDen.denominator!=numDen2.denominator){
    value.denominator=numDen2.denominator/numDen.denominator;
    value.numerator*=value.denominator;
    value.denominator*=value.denominator;
    value.numerator=numDen.numerator-numDen2.numerator;
}
return value;
}

As you can see..its in a function..my add and subtract functions are the same code so I just posted one

Answer 1

a/b - c/d = (ad - bc) / bd

Then you need to reduce that to lowest terms (if you care about that).