To compare floats to zero, or each other, use the following functions:
func fequal(_ a: Double, _ b: Double) -> Bool {
return fabs(a - b) < DBL_EPSILON
} func fequal(_ a: Float, _ b: Float) -> Bool {
return fabs(a - b) < FLT_EPSILON
} func fequal(_ a: CGFloat, _ b: CGFloat) -> Bool {
return fabs(a - b) < CGFloat(FLT_EPSILON)
} func fequalzero(_ a: Double) -> Bool {
return fabs(a) < DBL_EPSILON
} func fequalzero(_ a: Float) -> Bool {
return fabs(a) < FLT_EPSILON
} func fequalzero(_ a: CGFloat) -> Bool {
return fabs(a) < CGFloat(FLT_EPSILON)
}To test, paste the above and the below code in a playground:
var a: Double = 0.1
var b: Double = 0.2
var c: Double = 0.3
let d = a + b if c == d {
print("Equal!")
} else {
print("Not equal")
} if fequal(c, d) {
print("Equal!")
} else {
print("Not equal")
}