Convert Float to Int [closed]

Answer 1

Try this :

int numInt = (int)Math.Ceiling(numFloat);

msdn documentation

You may want Math.Round() or Math.Floor() by the way.

Example :

float numFloat = 1.5f;
int testCeiling = (int)Math.Ceiling(numFloat);
int testFloor = (int)Math.Floor(numFloat);
int testRound = (int)Math.Round(numFloat);

Console.WriteLine("testCeiling = {0}", testCeiling.ToString());
Console.WriteLine("testFloor = {0}", testFloor.ToString());
Console.WriteLine("testRound= {0}", testRound.ToString());

output :

testCeiling = 2
testFloor = 1
testRound= 2

Answer 2

Firstly, there are integers and floating-point numbers. Integers are always whole numbers, such as 0, 1, -32, 42 and 1337. On the other hand, floating-point numbers can have a fractional part: 0, 1, -32.1, 42.7 and 123.456788 are all valid floating-point numbers.

When converting between integers (int) and floating-point (float) numbers, you can do this:

int someInt = 42;
float someFloat = someInt;  // 42.0f

But you can't do this:

float someFloat = 42.7f;
int someInt = someFloat;    // ?

The reason the first conversion is possible, is that converting the integer number (int) to a floating-point number (float) does not change the number. It is a safe conversion, and therefore can be done implicitly.

The reason the second conversion is not allowed, is that converting the floating-point number (which may have a fractional part) to an integer number (that never has a fractional part) must drop the fractional part of the number, i.e. it becomes a different number. This is not safe, and can therefore only be done explicitly.

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To explicitly convert one type of number to another, you use a cast. That's the parentheses before the number with the type of the number that you want to convert it to.

float someFloat = 42.7f;
int someInt = (int)someFloat;               // 42

Note that the fractional part of the floating-point number was dropped. It's as if it has been rounded towards zero. If you want to round the floating-point number to the nearest whole number, use the Math.Round method.

float someFloat = 42.7f;
int someInt = (int)Math.Round(someFloat);   // 43