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Commitab9f74c

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Add BigInteger to karprekar number (#2899)
Co-authored-by: Andrii Siriak <siryaka@gmail.com>
1 parent2a27d09 commitab9f74c

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2 files changed

+36
-11
lines changed

2 files changed

+36
-11
lines changed

‎src/main/java/com/thealgorithms/maths/KaprekarNumbers.java‎

Lines changed: 23 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,5 @@
11
packagecom.thealgorithms.maths;
2+
importjava.math.BigInteger;
23
importjava.util.*;
34

45
publicclassKaprekarNumbers {
@@ -21,19 +22,31 @@ public static ArrayList<Long> kaprekarNumberInRange(long start, long end) throws
2122
}
2223

2324
// Checks whether a given number is Kaprekar Number or not
24-
publicstaticbooleanisKaprekarNumber(longnumber) {
25-
longnumberSquared =number *number;
26-
if(Long.toString(number).length() ==Long.toString(numberSquared).length()){
27-
return (number ==numberSquared);
25+
publicstaticbooleanisKaprekarNumber(longnum) {
26+
Stringnumber =Long.toString(num);
27+
BigIntegeroriginalNumber =newBigInteger(number);
28+
BigIntegernumberSquared =originalNumber.multiply(originalNumber);
29+
if(number.length() ==numberSquared.toString().length()){
30+
returnnumber.equals(numberSquared.toString());
2831
}
2932
else{
30-
longleftDigits1 =0,leftDigits2;
31-
if(Long.toString(numberSquared).contains("0")){
32-
leftDigits1 =Long.parseLong(Long.toString(numberSquared).substring(0,Long.toString(numberSquared).indexOf("0")));
33+
BigIntegerleftDigits1 =newBigInteger("0");
34+
BigIntegerleftDigits2;
35+
if(numberSquared.toString().contains("0")){
36+
leftDigits1 =newBigInteger(
37+
numberSquared.toString().
38+
substring(0,numberSquared.toString().indexOf("0")
39+
)
40+
);
3341
}
34-
leftDigits2 =Long.parseLong(Long.toString(numberSquared).substring(0, (Long.toString(numberSquared).length() -Long.toString(number).length())));
35-
longrightDigits =Long.parseLong(Long.toString(numberSquared).substring(Long.toString(numberSquared).length() -Long.toString(number).length()));
36-
return (number == (leftDigits1 +rightDigits)) || (number == (leftDigits2 +rightDigits));
42+
leftDigits2 =newBigInteger(
43+
numberSquared.toString()
44+
.substring(0, (numberSquared.toString().length() -number.length()))
45+
);
46+
BigIntegerrightDigits =newBigInteger(numberSquared.toString().substring(numberSquared.toString().length() -number.length()));
47+
Stringx =leftDigits1.add(rightDigits).toString();
48+
Stringy =leftDigits2.add(rightDigits).toString();
49+
return (number.equals(x)) || (number.equals(y));
3750
}
3851
}
3952

‎src/test/java/com/thealgorithms/maths/KaprekarNumbersTest.java‎

Lines changed: 13 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,7 @@
11
packagecom.thealgorithms.maths;
22

33
importorg.junit.jupiter.api.Test;
4-
4+
importjava.util.ArrayList;
55
importstaticorg.junit.jupiter.api.Assertions.*;
66

77
publicclassKaprekarNumbersTest {
@@ -55,4 +55,16 @@ void testFor98()
5555
assertFalse(KaprekarNumbers.isKaprekarNumber(98));
5656
}
5757

58+
@Test
59+
voidtestForRangeOfNumber() {try {
60+
ArrayList<Long>rangedNumbers =KaprekarNumbers.kaprekarNumberInRange(1,100000);
61+
long[]allTheNumbers = {1,9,45,55,99,297,703,999,2223,2728,4950,5050,7272,7777,9999,17344,22222,77778,82656,95121,99999};
62+
for (longi:allTheNumbers) {
63+
assertrangedNumbers.contains(i);
64+
}
65+
}catch (Exceptione) {
66+
assertfalse;
67+
}
68+
}
69+
5870
}

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