36 lines
624 B
Java
36 lines
624 B
Java
// Java version of a Prime Number Finder
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// haplo@mindstab.net
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class primes {
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public static void main(String[] s)
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{
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if(s.length < 1) {
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System.out.println("Useage: java primes [Max Num]\n");
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System.exit(1);
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}
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int max = Integer.valueOf(s[0]).intValue();
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if(max < 1) {
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System.out.println("Invalid Max Num\n");
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System.exit(1);
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}
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for(int i =3; i<=max; i+=2)
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{
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int maxTest = (int)Math.sqrt(i);
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boolean isPrime = true;
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for(int p = 3; p<= maxTest; p+=2)
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{
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if( (i%p) == 0)
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{
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isPrime = false;
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break;
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}
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}
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if(isPrime)
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{
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System.out.println(i);
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}
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}
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}
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}
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