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PrintFirstNPrimes.java
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PrintFirstNPrimes.java
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// count = 3, prints 2,3,5
// count = 4, prints 2,3,5,7
public class PrintFirstNPrimes {
static void printFirstNPrimeNumbers(int count) {
int nextPrime = 2;
if (count == 0) {
return;
}
if (count == 1) {
System.out.print(nextPrime);
return;
} else {
System.out.print(nextPrime + ", ");
}
for (int i = 1; i < count; i++) {
while (true) {
nextPrime = nextPrime + 1;
if (isComposite(nextPrime)) {
continue;
} else {
if (i == count) {
System.out.println(nextPrime);
} else {
System.out.print(nextPrime + ", ");
}
break;
}
}
}
}
static boolean isComposite(int n) {
for (int i = 2; i <= Math.sqrt(n); i++) {
if (n % i == 0)
return true;
}
return false;
}
public static void main(String[] args) {
if (args.length < 1) {
System.out.println("Usage java -cp . PrintFirstNPrimes number");
}
printFirstNPrimeNumbers(Integer.parseInt(args[0]));
}
}