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Merged
merged 5 commits into from
Jan 30, 2019
Merged

conversion binary to hexadecimal #694

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6268d39
arodriguez33 Jan 27, 2019
2bcc4c9
arodriguez33 Jan 28, 2019
6312a1e
binary number in 64 bits
arodriguez33 Jan 29, 2019
d082862
Update BinaryToHexadecimal.java
yanglbme Jan 30, 2019
4f1fcee
Update BinaryToHexadecimalTest.java
yanglbme Jan 30, 2019
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52 changes: 52 additions & 0 deletions src/main/java/com/conversions/BinaryToHexadecimal.java
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package src.main.java.com.conversions;

import java.math.BigInteger;
import java.util.HashMap;
import java.util.Map;


public class BinaryToHexadecimal {

/**
* hm to store hexadecimal codes for binary numbers
* within the range: 0000 to 1111 i.e. for decimal numbers 0 to 15
*/
private static Map<Integer, String> hmHexadecimal = new HashMap<>(16);

static {
int i;
for (i = 0; i < 10; i++)
hmHexadecimal.put(i, String.valueOf(i));

for (i = 10; i < 16; i++)
hmHexadecimal.put(i, String.valueOf((char) ('A' + i - 10)));
}

/**
* This method converts a binary number to
* a hexadecimal number.
*
* @param binStr The binary number
* @return The hexadecimal number
*/

public String binToHex(String binStr) {
BigInteger binary = new BigInteger(binStr);
// String to store hexadecimal code
String hex = "";

int currentBit;
BigInteger tenValue = new BigInteger("10");
while (binary.compareTo(BigInteger.ZERO) != 0) {
// to store decimal equivalent of number formed by 4 decimal digits
int code4 = 0;
for (int i = 0; i < 4; i++) {
currentBit = binary.mod(tenValue).intValueExact();
binary = binary.divide(tenValue);
code4 += currentBit * Math.pow(2, i);
}
hex = hmHexadecimal.get(code4) + hex;
}
return hex;
}
}
16 changes: 16 additions & 0 deletions src/test/java/com/conversions/BinaryToHexadecimalTest.java
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package src.test.java.com.conversions;

import org.junit.Test;
import src.main.java.com.conversions.BinaryToHexadecimal;
import org.junit.Assert;

public class BinaryToHexadecimalTest {

@Test
public void testBinaryToHexadecimal(){
BinaryToHexadecimal binaryToHexadecimal = new BinaryToHexadecimal();
Assert.assertEquals("Incorrect Conversion", "2A", binaryToHexadecimal.binToHex("101010"));
Assert.assertEquals("Incorrect Conversion", "24", binaryToHexadecimal.binToHex("100100"));
Assert.assertEquals("Incorrect Conversion", "AAAAAAAAAAAAAAAAAA1", binaryToHexadecimal.binToHex("1010101010101010101010101010101010101010101010101010101010101010101010100001"));
}
}