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Tarikh Chouhan February 2016
### How to regularly update an an integer

So I have a String[] which contains math expressions like "3+6=" or "5+9/8=". I have a function that gets the array, loops through the array and while looping, it splits the array so that I have one String[] containing the math operations like +,-,*,/ and another int[] containing the numbers in the question.

The function then puts the the answer into a int[] called answers. My question is that why when I output the answers[0], I can only see the first number and not the answer to the first question?

EDIT = I have found out that where the problem is happening. It is happening in my evaluation method. I dont know why:

```
public int evaluateAnswerTwoOperations(String operation, int numberOne, int numberTwo) {
switch(operation){
case "+":
Log.d("usingsubtraction","plus2nmbers");
return numberOne + numberTwo;
case "-":
Log.d("usingsubtraction","usingsubtraction");
return numberOne - numberTwo;
case "/":
Log.d("usingsubtraction","usingdivision");
return numberOne / numberTwo;
default:
Log.d("usingsubtraction","usingmultiplication");
return numberOne*numberTwo;
}
```

Something like this:

```
import android.util.Log;
public class TwoNumberOperation {
private final String PLUS = "+";
private final String MINUS = "-";
private final String MULTIPLY = "*";
private final String DIVIDE = "/";
private final String EQUAL = "=";
private String operation;
private int numberOne;
private int numberTwo;
public TwoNumberOperation(String operation, int numberOne, int numberTwo) {
if (operation.equalsIgnoreCase(PLUS) ||
operation.equalsIgnoreCase(MINUS) ||
operation.equalsIgnoreCase(MULTIPLY) ||
operation.equalsIgnoreCase(DIVIDE)) {
this.operation = operation;
this.numberOne = numberOne;
this.numberTwo = numberTwo;
}
else {
Log.d("error", "error: invalid operation");
this.operation = "";
this.numberOne = 0;
this.numberTwo = 0;
}
}
public int getAnswer() {
switch (operation) {
case PLUS:
Log.d("addition", "addition");
return numberOne + numberTwo;
case MINUS:
Log.d("subtraction", "subtraction");
return numberOne - numberTwo;
case MULTIPLY:
Log.d("multiplication", "multiplication");
return numberOne / numberTwo;
case DIVIDE:
Log.d("division", "division");
return numberOne / numberTwo; // note the returning an int
default:
Log.d("error", "error");
return -999999999;
}
}
@Override
public String toString() {
return numberOne + operation + numberTwo + EQUAL;
}
}
```

Asked in February 2016

Viewed 3,985 times

Voted 6

Answered 1 times

Viewed 3,985 times

Voted 6

Answered 1 times