Add Fractions

package Problems_On_Number;

public class AddFractions {
    static int gcd(int a, int b) {
        if (b == 0) {
            return a;
        }
        return gcd(b, a % b);
    }

    static void simple(int num3, int den3) {
        int gcd = gcd(num3, den3);
        // dividing num and den by gcd to get the fraction
        // in the simplest form.
        num3 /= gcd;
        den3 /= gcd;
    }

    public static void main(String args[]) {
        int num1 = 3, den1 = 4, num2 = 1, den2 = 7, num3, den3;
        int lcm = (den1 * den2) / gcd(den1, den2);
        // answer's denominator will be lcm of den1 and den2
        den3 = lcm;
        // changing numerators to have same denominator and then adding
        num3 = num1 * (den3 / den1) + num2 * (den3 / den2);
        simple(num3, den3);
        System.out.println(num1 + "/" + den1 + " + " + num2 + "/" + den2 + " = " + num3 + "/" +
                den3);
    }

}