64 lines
1.9 KiB
Java
64 lines
1.9 KiB
Java
package sum;
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import java.math.BigDecimal;
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import java.math.BigInteger;
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/**
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* @author Nikita Doschennikov (me@fymio.us)
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*/
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public class SumBigDecimalHex {
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public static void main(String[] args) {
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BigDecimal res = new BigDecimal("0");
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for (String arg : args) {
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StringBuilder builder = new StringBuilder();
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int idxOfS = -1;
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for (char c : arg.toCharArray()) {
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if (!Character.isWhitespace(c)) {
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if (c == 's' || c == 'S') {
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idxOfS = builder.length();
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}
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builder.append(c);
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} else {
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res = res.add(compute(builder.toString(), idxOfS));
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idxOfS = -1;
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builder = new StringBuilder();
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}
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}
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res = res.add(compute(builder.toString(), idxOfS));
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}
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System.out.println(res);
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}
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static BigDecimal compute(String num, int idxOfS) {
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BigDecimal res = BigDecimal.ZERO;
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if (num == null || num.isEmpty()) {
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return res;
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} else if (num.startsWith("0x") || num.startsWith("0X")) {
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num = num.toLowerCase();
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num = num.substring(2);
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if (idxOfS != -1) {
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idxOfS -= 2;
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String mantissaHex = num.substring(0, idxOfS);
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String exponentHex = num.substring(idxOfS + 1);
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BigInteger mantissa = new BigInteger(mantissaHex, 16);
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BigInteger exponent = new BigInteger(exponentHex, 16);
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res = res.add(
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new BigDecimal(mantissa).scaleByPowerOfTen(
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exponent.negate().intValueExact()
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)
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);
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} else {
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res = res.add(new BigDecimal(new BigInteger(num, 16)));
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}
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} else {
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res = new BigDecimal(num);
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}
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return res;
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}
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}
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