Examples of java.math.BigInteger.pow()

java.math.BigInteger.pow()
Returns a BigInteger whose value is (this^exponent). Note that {@code exponent} is an integer rather than a BigInteger. @param exponent exponent to which this BigInteger is to be raised. @return this^exponent @throws ArithmeticException {@code exponent} is negative. (This wouldcause the operation to yield a non-integer value.)

            final String msg =
                "Unknow disk capacityAllocationUnits factor [" + allocationUnits + "]";
            throw new RuntimeException(msg);
        }


        return bytes.divide(factor.pow(20)).longValue();
    }
}

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      return BigInteger.valueOf(LongMath.sqrt(x.longValue(), mode));
    }
    BigInteger sqrtFloor = sqrtFloor(x);
    switch (mode) {
      case UNNECESSARY:
        checkRoundingUnnecessary(sqrtFloor.pow(2).equals(x)); // fall through
      case FLOOR:
      case DOWN:
        return sqrtFloor;
      case CEILING:
      case UP:

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      case CEILING:
      case UP:
        int sqrtFloorInt = sqrtFloor.intValue();
        boolean sqrtFloorIsExact =
            (sqrtFloorInt * sqrtFloorInt == x.intValue()) // fast check mod 2^32
            && sqrtFloor.pow(2).equals(x); // slow exact check
        return sqrtFloorIsExact ? sqrtFloor : sqrtFloor.add(BigInteger.ONE);
      case HALF_DOWN:
      case HALF_UP:
      case HALF_EVEN:
        BigInteger halfSquare = sqrtFloor.pow(2).add(sqrtFloor);

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        }
        else if ("byte * 2^10".equals(allocationUnits) || "KB".equalsIgnoreCase(allocationUnits)
            || "KILOBYTE".equalsIgnoreCase(allocationUnits)
            || "KILOBYTES".equalsIgnoreCase(allocationUnits)) // kb
        {
            bytes = capa.multiply(factor.pow(10));
        }
        else if ("byte * 2^20".equals(allocationUnits) || "MB".equalsIgnoreCase(allocationUnits)
            || "MEGABYTE".equalsIgnoreCase(allocationUnits)
            || "MEGABYTES".equalsIgnoreCase(allocationUnits)) // mb
        {

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        }
        else if ("byte * 2^20".equals(allocationUnits) || "MB".equalsIgnoreCase(allocationUnits)
            || "MEGABYTE".equalsIgnoreCase(allocationUnits)
            || "MEGABYTES".equalsIgnoreCase(allocationUnits)) // mb
        {
            bytes = capa.multiply(factor.pow(20));
        }
        else if ("byte * 2^30".equals(allocationUnits) || "GB".equalsIgnoreCase(allocationUnits)
            || "GIGABYTE".equalsIgnoreCase(allocationUnits)
            || "GIGABYTES".equalsIgnoreCase(allocationUnits)) // gb
        {

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        }
        else if ("byte * 2^30".equals(allocationUnits) || "GB".equalsIgnoreCase(allocationUnits)
            || "GIGABYTE".equalsIgnoreCase(allocationUnits)
            || "GIGABYTES".equalsIgnoreCase(allocationUnits)) // gb
        {
            bytes = capa.multiply(factor.pow(30));
        }
        else if ("byte * 2^40".equals(allocationUnits) || "TB".equalsIgnoreCase(allocationUnits)
            || "TERABYTE".equalsIgnoreCase(allocationUnits)
            || "TERABYTES".equalsIgnoreCase(allocationUnits)) // tb
        {

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        }
        else if ("byte * 2^40".equals(allocationUnits) || "TB".equalsIgnoreCase(allocationUnits)
            || "TERABYTE".equalsIgnoreCase(allocationUnits)
            || "TERABYTES".equalsIgnoreCase(allocationUnits)) // tb
        {
            bytes = capa.multiply(factor.pow(40));
        }
        else
        {
            final String msg =
                "Unknow disk capacityAllocationUnits factor [" + allocationUnits + "]";

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            final String msg =
                "Unknow disk capacityAllocationUnits factor [" + allocationUnits + "]";
            throw new RuntimeException(msg);
        }


        return bytes.divide(factor.pow(20)).longValue();
    }
}

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            StringTokenizer st=new StringTokenizer(stdin.readLine());


            BigInteger N=new BigInteger(st.nextToken());
            int P=Integer.parseInt(st.nextToken());


            N=N.pow(P);
            String s=N.toString();


            int n=(s.length()+69)/70;


            for(int i=0;i<n;i++) System.out.println(s.substring(70*i,Math.min(70*(i+1),s.length())));

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        }
        else if ("byte * 2^10".equals(allocationUnits) || "KB".equalsIgnoreCase(allocationUnits)
            || "KILOBYTE".equalsIgnoreCase(allocationUnits)
            || "KILOBYTES".equalsIgnoreCase(allocationUnits)) // kb
        {
            bytes = capa.multiply(factor.pow(10));
        }
        else if ("byte * 2^20".equals(allocationUnits) || "MB".equalsIgnoreCase(allocationUnits)
            || "MEGABYTE".equalsIgnoreCase(allocationUnits)
            || "MEGABYTES".equalsIgnoreCase(allocationUnits)) // mb
        {

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