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// The MIT License (MIT)
//
// Copyright (c) 2016 Robert C. Seacord
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package NUM00J;
import java.lang.Integer;
class safeArithmetic {
private static int safeAdd(int left, int right) throws ArithmeticException {
if (right > 0 ? left > Integer.MAX_VALUE - right
: left < Integer.MIN_VALUE - right) {
throw new ArithmeticException("Integer overflow"); //$NON-NLS-1$
}
return left + right;
}
static int safeSubtract(int left, int right)
throws ArithmeticException {
if (right > 0 ? left < Integer.MIN_VALUE + right
: left > Integer.MAX_VALUE + right) {
throw new ArithmeticException("Integer overflow"); //$NON-NLS-1$
}
return left - right;
}
static int safeMultiply(int left, int right)
throws ArithmeticException {
if (right > 0 ? left > Integer.MAX_VALUE / right
|| left < Integer.MIN_VALUE / right
: (right < -1 ? left > Integer.MIN_VALUE / right
|| left < Integer.MAX_VALUE / right : right == -1
&& left == Integer.MIN_VALUE)) {
throw new ArithmeticException("Integer overflow"); //$NON-NLS-1$
}
return left * right;
}
static int safeDivide(int left, int right) throws ArithmeticException {
if ((left == Integer.MIN_VALUE) && (right == -1)) {
throw new ArithmeticException("Integer overflow"); //$NON-NLS-1$
}
return left / right;
}
static int safeNegate(int a) throws ArithmeticException {
if (a == Integer.MIN_VALUE) {
throw new ArithmeticException("Integer overflow"); //$NON-NLS-1$
}
return -a;
}
static int safeAbs(int a) throws ArithmeticException {
if (a == Integer.MIN_VALUE) {
throw new ArithmeticException("Integer overflow"); //$NON-NLS-1$
}
return Math.abs(a);
}
static public void main(String[] args) {
try {
System.out.println(safeAdd(5, 10));
} catch (ArithmeticException ae) {
System.err.println("ArithmeticException: " + ae.getMessage()); //$NON-NLS-1$
}
System.out.println(5 + Integer.MAX_VALUE);
try {
System.out.println(safeAdd(5, Integer.MAX_VALUE));
} catch (ArithmeticException ae) {
System.err.println("ArithmeticException: " + ae.getMessage()); //$NON-NLS-1$
}
System.out.println(-5 + Integer.MIN_VALUE);
try {
System.out.println(safeAdd(-5, Integer.MIN_VALUE));
} catch (ArithmeticException ae) {
System.err.println("ArithmeticException: " + ae.getMessage()); //$NON-NLS-1$
}
}
}