43 lines
686 B
C#
43 lines
686 B
C#
// C# version of a Prime Number Finder
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// Build under Mono .28
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// haplo@mindstab.net
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using System;
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class Primes {
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private static void Main(String[] argv)
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{
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int MAX=0;
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if(argv.Length >= 1) {
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try {
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MAX = (int)Convert.ToDouble(argv[0]);
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} catch {
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Console.WriteLine("Invalid Max Num");
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return;
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}
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} else {
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Console.WriteLine("Useage: primes.exe [Max Num]");
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return;
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}
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for(int cnt = 3; cnt <= MAX; cnt+= 2)
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{
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int test = (int) Math.Sqrt(cnt);
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int isPrime = 1;
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for(int i=3; i <= test; i+=2)
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{
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isPrime = cnt % i;
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if( isPrime == 0) {
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break;
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}
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}
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if(isPrime != 0)
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{
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Console.WriteLine(cnt);
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}
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}
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}
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}
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