var a = 12
var b = 25
var result = a & b
print (result) // 8
var a = 12
var b = 25
var result = a & b
print (result) // 8
var a = 12
var b = 25
var result = a | b
print(result) // 29
var b = 12
var result = ~b
print(result) // -13