Can someone explain the code?It's from C challenge.

Question

#define prod(i,j) i*j
int main(){
int x=3,y=4;
printf("%d",prod(x+2,y-1));
return 0;
}
Output is:10

Answer 1

i think it's this:
->prod(x + 2, y - 1)
->x + 2 * y - 1
->3 + 2 * 4 - 1
->3 + 8 - 1
->10

Answer 2

Thanks!....Anton Böhler