IF (a == 1) {
B = 1;
C = 2;
D = 2;
e = 4;
f = 5;
} else IF (a == 2) {
B = 3;
C = 4;
...
} else IF (a == 3) {
B = 5;
C = 6;
} ........ (n such judgment)
1
2
4
5
3
