Ios 检查浮点值

我在做一个小游戏，如果你得34分，意味着你得3乘以2，等于6，如果你得36分，意味着你得4*2=8，但如果你得35分，那就等于3.5*2=7

这是一个小代码，我可以检查你是否得到了6和以上或4和以下，但不是5，我有一个困难的时间来解决

// example:
// player score 35 he will get 7 because 3.5 * 2 = 7
// player score 37 he will get 8 because 4 * 2 = 8
// player score 32 he will get 6 because 3 * 2 = 6



var newScore = Double(score)
newScore = newScore / 10
newScore = round(newScore)
newScore = newScore * 2

// I am not sure how to check if the user gets 35 or 45 
// first I have to convert it to float so it will be 3.5 or 4.5
// then check if it has the .5 otherwise the round function will round it to 4 or 5 instead of * it by 2

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可能还有其他方法，但对于您的情况，您可以这样做

var newScore = Double(score) 
newScore = newScore / 10 
if score % 10 != 5 {  
    newScore = round(newScore)  
} 
print(newScore) 
print(newScore * 2)