There are two operators used in c# to handle the overflow exception control as given below.
- Checked Operator
- Unchecked Operator
1.) Checked Operator :-
C# provides the checked and Unchecked operators.If we use checked operator in codes, the CLR will enforce overflow checking and throw an exception if an overflow occurs. Example:-
private void button1_Click(object sender, EventArgs e)
{
byte m = 255;
checked
{
m++;
}
MessageBox.Show(m.ToString());
}
Output :-OverflowException was Unhandled
If we run this codes then we will get an error message. I will show it later.
Note :-
The Byte data type can only hold values in the range 0 to 255 ,so incrementing the value of m causes an overflow.
1.) UnChecked Operator :-
If we want to suppress overflow checking, we can use Unchecked operator.In this case, no exception will be raised,but we will lose our data.We already know that ,the byte type can't hold a value of greater than 255.So the overflow bits will be discarded.Variable m hold a value of zero.
Example:-
private void button2_Click(object sender, EventArgs e)
{
byte m = 255;
unchecked
{
m++;
}
MessageBox.Show("m=" +m.ToString());
}
Output :- m=0
