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fraction-exercise.go
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fraction-exercise.go
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package goworkshop
// Fraction contains a numerator and a denominator
type Fraction struct {
numerator int
denominator int
}
// Gcd finds the greatest common denominator of two numbers
func Gcd(a int, b int) int {
if b == 0 {
return a
}
return Gcd(b, a%b)
}
// CreateFraction creates a Fraction given a numerator and a denominator and returns a pointer to it
// If the denominator is zero, it returns an error with text "denominator must not be zero"
// When creating the Fraction, this function uses the Gcd function to simplify the Fraction
// AddFractions adds two fraction pointers and return a pointer to the result which is a new Fraction
// If the result denominator is zero, it returns an error with text "denominator must not be zero"
// As a reminder, adding two fractions is calculated like this:
// a/x + b/y = (ay + bx)/xy
// PrintFractions returns a string representation of the given Fraction pointers
// examples:
// PrintFractions([]*Fraction{ {1, 2} }) => Fractions: 1/2
// PrintFractions([]*Fraction{ {1, 2}, {2, 3} }) => Fractions: 1/2, 2/3