How to do multiple selection C++?

Question

Programming

Good afternoon. How to make multiple selection.
There are 3 variables.

int a = 2;
int b = 1;
int c = 2;

The bottom line is that different combinations - (a, b, c) - correspond to a certain value
For example
(2, 2, 2) is 0
(1, 1, 1) is 1
(2,1,1) is 9
How can you implement given multiple IF.
I tried with switch, but it didn't work.

Answer 1

int res;
if (2 == a && 2 == b && 2 == c)
  res = 0;
else if (1 == a && 1 == b && 1 == c)
  res = 1;
else if (2 == a && 1 == b && 1 == c)
  res = 9;