The code shows:
java.util.IllegalFormatConversionException: d != java.lang.String at java.util.Formatter$FormatSpecifier.failConversion(Formatter.java:4302) at java.util.Formatter$FormatSpecifier.printInteger(Formatter.java:2793) at java.util.Formatter$FormatSpecifier.print(Formatter.java:2747) a
public class addiePorterMod10Sieve {
void sieveOfEratosthenes(int n) {
boolean prime[] = new boolean[n + 1];
for (int i = 0; i < n; i++)
prime[i] = true;
for (int p = 2; p * p <= n; p++) {
if (prime[p] == true) {
for (int i = p * p; i <= n; i += p)
prime[i] = false;
}
}
for (int i = 2; i <= n; i++) {
if (prime[i] == true)
System.out.printf(i + "%-1s %-15n", " ");
}
}
public static void main(String args[]) {
int n = 1000;
addiePorterMod10Sieve g = new addiePorterMod10Sieve();
g.sieveOfEratosthenes(n);
}
}
Not very familiar with formatter myself, but the below workaround should achieve what you need as ouput :
int linecount = 0;
for(int i = 2; i <= n; i++)
{
if(prime[i] == true) {
// System.out.printf(i + "%-1s %-15d", " ");
linecount++;
System.out.print(i + " ");
if (linecount == 15) {
linecount =0;
System.out.println();
}
}
}
The error derives from %'s matching with a parameter.
int p = 0;
String nl = "\r\n";
for (int i = 2; i <= n; i++) {
if (prime[i]) {
++p;
System.out.printf("%-15d ", i);
if (p % 10 == 0) {
System.out.println();
}
//System.out.printf("%-15d%s", i, (p % 10 == 0 ? nl : " "));
}
}
Now %n
would indeed yield a newline ( "\\r\\n"
on Windows, "\\n"
on Linux) with a flush of the line. However you must place it in the format string,
My out-commented alternative misses immediate flushing to the console.
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