Why Does C# Integer Division Round Down, and How Can I Avoid It?

Division Rounding Down in C#

When performing division in C#, programmers may encounter unexpected rounding down behavior. This issue arises when integer division is performed, resulting in the loss of fractional parts.

To illustrate, consider the following code:

double i;
i = 200 / 3; // Integer division
MessageBox.Show(i.ToString());

This code will display a message box with the value "66". However, the expected result for 200 / 3 should be 66.66666...

Solution: Use Double Division

To avoid this rounding down and maintain floating-point precision, one should use double division instead of integer division. This can be achieved by:

1. Converting one of the operands to a double:

i = (double)200 / 3;

2. Using a trailing decimal point in one operand:

i = 200.0 / 3;

3. Appending the d suffix to one operand:

i = 200d / 3;

By using double division, the division operator / will perform floating-point division, retaining all significant digits.

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