Blue Bridge Cup training algorithm P1103

Blue Bridge Cup training algorithm P1103

Programming two complex operations. There are two complex and then their operation formula is:

Requirements: (1) defines a structure type described complex.
　　 (2) addition, subtraction, multiplication and division among a plurality of functions respectively not be realized.
　　(3) The method must be used to structure the result of a function pointer is returned.
　　
　　Description: The user input: an operational sign (+, -, *, / ) abc d.
　　Output: a + bi, the output regardless of a, b is less than or equal to zero are by the format of the output, the output a, b are retained two.

Input:
　　- 2.5 3.6 1.5 4.9
Output:
　　1.00 ± 1.30i

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import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        //Java中的复数运算
        Scanner sc=new Scanner(System.in);
        char s;
        s=sc.next().charAt(0);
        double a,b,c,d;
        a= sc.nextDouble();
        b= sc.nextDouble();
        c= sc.nextDouble();
        d= sc.nextDouble();
        if(s=='+')
            System.out.printf("%.2f+%.2fi",a+c,b+d);
        if(s=='-')
            System.out.printf("%.2f+%.2fi",a-c,b-d);
        if(s=='*')
            System.out.printf("%.2f+%.2fi",a*c-b*d,a*d+b*c);
        if(s=='/')
            System.out.printf("%.2f+%.2fi",(a*c+b*d)/(c*c+d*d),(b*c-a*d)/(c*c+d*d));
        System.out.println();

    }
}