public static void main(String[] args) {
// TODO Auto-generated method stub
Addition add = new Addition();
System.out.println("The sum is: " + add.addTwoNumbers(23, 3));
System.out.println("The sub is: " + add.subTwoNumbers(3, 4));
System.out.println("The Division is: " + add.division(6, 4));
}
public static int multiply(int a, int b) {
int sum = 0;
int counter = 0;
while (b != 0) {
int bit = b & 1;
if (bit == 1) {
sum = Addition.add(sum, a << counter);
}
counter = Addition.add(counter, 1);
b = b >> 1;
}
return sum;
}
public static Equation parse(String input) {
if (input == null) {
throw new NullPointerException("The parameter [input] is null.");
}
String[] sides = input.replace('(', ' ').replace(')', ' ').trim().split("=");
if (sides.length < 2) {
return null;
}
Derivation der = Derivation.parse(sides[0]);
Coefficient c = Coefficient.parse(sides[1]);
if (c != null) {
return new Equation(der, c);
}
Variable v = Variable.parse(sides[1]);
if (v != null) {
return new Equation(der, v);
}
Multiplication mul = Multiplication.parse(sides[1]);
if (mul != null) {
return new Equation(der, mul);
}
Addition add = Addition.parse(sides[1]);
if (add != null) {
return new Equation(der, add);
}
return null;
}
Addition(Addition add) {
this.operands = new ArrayList<Expression>();
for (Expression exp : add.getOperands()) {
this.operands.add(new Expression(exp));
}
copyEnvironment(add);
}
@Ignore
public void testIgnore() {
assertEquals(5, Addition.add(4, 1));
}
@Test
public void testSuccess2() {
assertEquals(7, Addition.add(4, 3));
}
@Test
public void testSuccess1() {
assertEquals(5, Addition.add(4, 1));
}
