C++ Tutorial/Operators statements/bitwise AND

determines if a value is a multiple of X

<source lang="cpp">#include <iostream> using namespace std; int multiple( int ); int main() {

  int y;
  cout << "Enter an integer between 1 and 32000: ";
  cin >> y;
  if ( multiple( y ) )
     cout << y << " is a multiple of X" << endl;
  else
     cout << y << " is not a multiple of X" << endl;
  return 0;

} int multiple( int num ) {

  int mask = 1, mult = 1;
  for ( int i = 0; i < 10; i++, mask <<= 1 )
     if ( ( num & mask ) != 0 ) {
        mult = 0;
        break;
     }
  return mult;

}</source>

Uppercase letters using bitwise AND.

<source lang="cpp">#include <iostream> using namespace std; int main() {

 char ch;
 for(int i = 0 ; i < 10; i++)  {
   ch = "a" + i;
   cout << ch << " " ;
   ch = ch & 223;
   cout << ch << "\n";
 }
 return 0;

}</source>

a A
b B
c C
d D
e E
f F
g G
h H
i I
j J