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IsNumberPalindromic.java
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IsNumberPalindromic.java
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package epi;
import epi.test_framework.EpiTest;
import epi.test_framework.GenericTest;
public class IsNumberPalindromic {
@EpiTest(testDataFile = "is_number_palindromic.tsv")
public static boolean isPalindromeNumber(int x) {
if (x <= 0) {
return x == 0;
}
final int numDigits = (int)(Math.floor(Math.log10(x))) + 1;
int msdMask = (int)Math.pow(10, numDigits - 1);
for (int i = 0; i < (numDigits / 2); ++i) {
if (x / msdMask != x % 10) {
return false;
}
x %= msdMask; // Remove the most significant digit of x.
x /= 10; // Remove the least significant digit of x.
msdMask /= 100;
}
return true;
}
public static void main(String[] args) {
System.exit(
GenericTest
.runFromAnnotations(args, "IsNumberPalindromic.java",
new Object() {}.getClass().getEnclosingClass())
.ordinal());
}
}