package text.java;
import java.util.StringTokenizer;

    public abstract class Calculate {
        static double a,b,c,d;
        double RealPart;
        double ImagePart;
        static String choose;
        public static char ch;

        public void Add() {
            RealPart = a + c;
            ImagePart = b + d;
        }

        public void Sub() {
            RealPart = a - c;
            ImagePart = b - d;
        }

        public void Mul() {
            RealPart = a*c - b*d;
            ImagePart = b*c + a*d;
        }

        public void Div() {
            RealPart = (a*c - b*d)/(c*c + d*d);
            ImagePart = (b*c + a*d)/(c*c + d*d);
        }

        public String toString(String s) {
            if(ImagePart >= 0){
                return s + "=" + RealPart + "+" + ImagePart + "i";
            }else {
                return s + "=" + RealPart +""+ ImagePart + "i";
            }
        }

        public void Faction(String f){
            char z;                                //取出不用于计算的符号
            StringTokenizer st = new StringTokenizer(f, " ", false);
            z = st.nextToken().charAt(0);
            a = Double.parseDouble(st.nextToken());
            z = st.nextToken().charAt(0);
            b = Double.parseDouble(st.nextToken());
            z = st.nextToken().charAt(0);
            z = st.nextToken().charAt(0);
            ch = st.nextToken().charAt(0);
            z = st.nextToken().charAt(0);
            c = Double.parseDouble(st.nextToken());
            z = st.nextToken().charAt(0);
            d = Double.parseDouble(st.nextToken());
        }
}