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Assume the availability of an existing class , ICalculator, that models an integer arithmetic calculator and contains:
an instance variable currentValue that stores the current int value of the calculator
a getter method for the above instance variable
methods add, sub, mul, and div
Each method in ICalculator receives an int argument and applies its operation to currentValue and returns the new value ofcurrentValue. So, if currentValue has the value 8 and sub(6) is invoked then currentValueends up with the value 2, and 2 is returned.
So, you are to write the definition of a subclass, ICalculator1, based on ICalculator. The class ICalculator1 has one additional method ,sign, that receives no arguments , and doesn’t modify currentValue. Instead, it simply returns 1, 0 or -1 depending on the whether currentValue is positive, zero, or negative respectively.
Expert Answer
So given statment is,
The class ICalculator1 has one additional method ,sign, that receives no arguments , and doesn't modify currentValue. Instead, it simply returns 1, 0 or -1 depending on the whether currentValue is positive, zero, or negative respectively.
Here is the solutions.
public class ICalculator1 extends ICalculator {
public int sign() {
if (currentValue != 0) {
return currentValue * -1;}
else {
return 0;
}
}
}
or you can try this alternative soluton.
public int sign() {
int value = add(0); // add 0 and return currentValue
if (value > 0) return 1;
else if (value < 0) return -1;
else return 0;
}
