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Errors in Integer Arithmetic in Java


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This article is regarding Errors in Integer Arithmetic in Java.
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◕ Errors in Integer Arithmetic in Java.

When we perform any arithmetic calculation with integer type in Java then sometimes we don't get the proper result.
We get these errors for the following reasons.

■ If we divide an integer value by zero. Then we get an error.

■ If we use the % operator with an expression that has a Zero value at the right hand side.
Example: restNum = totalNum % 0;

■ If an integer expression results a value that is outside the range of the int type, then the result is truncated to the number of bits upto the int type range. Hence we get an incorrect result. But Java does not indicate this as an error though the result is incorrect. Therefore we should careful for this.

■ Again we can get an interesting result. Let have an example statement first.
totalNum = ( 3000000 * 4000000 ) / 2000000;

In this case we will get a wrong answer.
Because ( 3000000 * 4000000 ) this part produces an answer that exceeds the range of the int type.
As a result the answer is already truncated before the division takes place.
Obviously after the division we will get the wrong answer again.
And the Java will not show any error for this wrong answer.

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