PROGRAMMING:Calculate the product of the sum of two complex numbers
Input the real part and imaginary part of two complex numbers respectively, and use the function to calculate the product of the sum of two complex numbers.
If the two complex numbers are: C1 = X1 + (Y1) I, C2 = x2 + (Y2) I,
Then:
```
c1+c2 = (x1+x2) + (y1+y2)i
c1*c2 = (x1*x2-y1*y2) + (x1*y2+x2*y1)i
```
###Input format:
The input gives four real numbers in one line, representing the real and imaginary parts of C1 and C2 respectively.
###Output format:
The calculation results of C1 + C2 and C1 * C2 are output in two lines respectively.
###Input example:
```in
1 1 -2 3
```
###Output example:
```out
addition of complex is -1.000000+4.000000i
product of complex is -5.000000+1.000000i
```
answer：If there is no answer, please comment
If the two complex numbers are: C1 = X1 + (Y1) I, C2 = x2 + (Y2) I,
Then:
```
c1+c2 = (x1+x2) + (y1+y2)i
c1*c2 = (x1*x2-y1*y2) + (x1*y2+x2*y1)i
```
###Input format:
The input gives four real numbers in one line, representing the real and imaginary parts of C1 and C2 respectively.
###Output format:
The calculation results of C1 + C2 and C1 * C2 are output in two lines respectively.
###Input example:
```in
1 1 -2 3
```
###Output example:
```out
addition of complex is -1.000000+4.000000i
product of complex is -5.000000+1.000000i
```
answer：If there is no answer, please comment