Given two strings representing two complex numbers.
You need to return a string representing their multiplication. Note i2 = -1 according to the definition.
Example 1:
Input: "1+1i", "1+1i" Output: "0+2i" Explanation: (1 + i) * (1 + i) = 1 + i2 + 2 * i = 2i, and you need convert it to the form of 0+2i.
Example 2:
Input: "1+-1i", "1+-1i" Output: "0+-2i" Explanation: (1 - i) * (1 - i) = 1 + i2 - 2 * i = -2i, and you need convert it to the form of 0+-2i.
Note:
The input strings will not have extra blank. The input strings will be given in the form of a+bi, where the integer a and b will both belong to the range of [-100, 100]. And the output should be also in this form. 这道题其实看起来就很简单，所以也采用了很简单的方式，代码看起来写的也很烂。 public static String complexNumberMultiply(String a, String b) { String[] a1 = a.split("\\+"); String[] b1 = b.split("\\+"); int temp1,temp2,temp3; temp1 = Integer.valueOf(a1[0])*Integer.valueOf(b1[0]); temp2 = Integer.valueOf(a1[1].replace("i", ""))*Integer.valueOf(b1[1].replace("i","")); temp3 = Integer.valueOf(a1[0])*Integer.valueOf(b1[1].replace("i",""))+Integer.valueOf(a1[1].replace("i", ""))*Integer.valueOf(b1[0]); int cur = temp1 - temp2; String res = Integer.toString(cur) +"+"+ temp3+"i"; return res; }