1.1-1.3

1.1
ref int s1, ref int s2, ref int s3, int bonus

s1 = s1 + bonus;
s2 = s2 + bonus;
s3 = s3 + bonus;

1.2
ref int a, ref int b

int x = a;
a = b;
b = x;

1.3
ref int a, ref int b
 ref n1 , ref n2