swift中的第n个素数 [英] nth prime number in swift
本文介绍了swift中的第n个素数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试在 xCode 的 Swift 中找到第 n 个素数,但我似乎无法使其正常工作,它只是提供了一个素数列表.
I'm trying to find the nth prime number in xCode's Swift, but I can't seem to get this working, it just gives a list of prime numbers.
func nthPrimeNumber (n: Int) -> Int
{
var prime: Int
var divisor: Int
var isPrime: Bool
for (prime = 2; prime <= 50; ++prime )
{
isPrime = true;
for (divisor = 2; divisor < prime; ++divisor )
{
if ((prime % divisor) == 0 )
{
isPrime = false
}
}
if (isPrime == true )
{
println(" \(prime)")
}
}
return prime
}
推荐答案
对代码进行最少的更改,但是,正如评论者所说,添加终止逻辑:
Making minimal changes to your code, but, as commenter said, adding termination logic:
func nthPrimeNumber(n: Int) -> Int {
var prime: Int
var divisor: Int
var isPrime: Bool
var counter = 0
for (prime = 2; prime <= 50 && counter < n; ++prime )
{
isPrime = true;
for (divisor = 2; divisor < prime; ++divisor )
{
if ((prime % divisor) == 0 )
{
isPrime = false
}
}
if (isPrime)
{
counter++
}
}
return prime-1
}
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