int main(){
 int iFlags [101]; //we won't use element 0
 //ensure all flags are 0
 for(int i = 1 ; i < 101 ; i++){
  iFlags[i] = 0;
 }
 
 //Mark the 3s
 for(int i = 3 ; i < 101 ; i = i + 3){
  iFlags[i] = 1;
 }

 //Mark the 5s Use OR so that the result doesn't lose whether it's a 3
 for(int i = 5 ; i < 101 ; i = i + 5){
  iFlags[i] = iFlags[i] | 2;
 }

 for(int i = 1 ; i < 101 ; i++){
  switch(iFlags[i]){
   case 0: cout << i << endl; break;
   case 1: cout << "Fizz" << endl; break;
   case 2: cout << "Buzz" << endl; break;
   case 3: cout << "Fizz AND Buzz, yo!" << endl; break;
  }
 }

 return 0;
}

1
2
Fizz
4
Buzz
Fizz
7
8
Fizz
Buzz
11
Fizz
13
14
Fizz AND Buzz, yo!
16
17
Fizz
19
Buzz
Fizz
22
23
Fizz
Buzz
26
Fizz
28
29
Fizz AND Buzz, yo!
31
32
Fizz
34
Buzz
Fizz
37
38
Fizz
Buzz
41
Fizz
43
44
Fizz AND Buzz, yo!
46
47
Fizz
49
Buzz
Fizz
52
53
Fizz
Buzz
56
Fizz
58
59
Fizz AND Buzz, yo!
61
62
Fizz
64
Buzz
Fizz
67
68
Fizz
Buzz
71
Fizz
73
74
Fizz AND Buzz, yo!
76
77
Fizz
79
Buzz
Fizz
82
83
Fizz
Buzz
86
Fizz
88
89
Fizz AND Buzz, yo!
91
92
Fizz
94
Buzz
Fizz
97
98
Fizz
Buzz