Notice: This page requires JavaScript to function properly.
Please enable JavaScript in your browser settings or update your browser.Learn Floating-Point and Double | Dealing with Data Types
C# Basics

bookFloating-Point and Double

Floating point numbers, also called floats, represent decimal numbers. We can declare a variable of type float using the float keyword:

main.cs

main.cs

copy

              
1

            
float myVariable = 3.14f;

The letter 'f' in the value 3.14f tells the compiler that the value is of type float. Values of the float datatype should always be represented in this format.

The float data type has a limited precision so it can only store 6 to 9 digits after the decimal. There is another datatype called double which offers a higher precision:

main.cs

main.cs

copy

              
12345

            
float myVar1 = 3.1415926535897f;
double myVar2 = 3.1415926535897;

Console.WriteLine(myVar1); // Output: 3.1415927
Console.WriteLine(myVar2); // Output: 3.1415926535897

As float has a lower precision, the value 3.1415926535897 is automatically rounded off till its 7th decimal digit and the result is stored in the variable myVar1.

Like int and long, we can also perform arithmetic operations on float and double values.

main.cs

main.cs

copy

              
12345

            
float var1 = 1.14f;
double var2 = 1.00;
float var3 = 1.0f;

double var4 = var1 + var2 + var3;
question mark

Which of these is the correct declaration of a float variable?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 2. ChapterΒ 3

Ask AI

expand

Ask AI

ChatGPT

Ask anything or try one of the suggested questions to begin our chat

Suggested prompts:

What is the difference between float and double in terms of usage?

Can you give examples of arithmetic operations with float and double?

When should I use float instead of double?

Awesome!

Completion rate improved to 1.59

bookFloating-Point and Double

Swipe to show menu

Floating point numbers, also called floats, represent decimal numbers. We can declare a variable of type float using the float keyword:

main.cs

main.cs

copy

              
1

            
float myVariable = 3.14f;

The letter 'f' in the value 3.14f tells the compiler that the value is of type float. Values of the float datatype should always be represented in this format.

The float data type has a limited precision so it can only store 6 to 9 digits after the decimal. There is another datatype called double which offers a higher precision:

main.cs

main.cs

copy

              
12345

            
float myVar1 = 3.1415926535897f;
double myVar2 = 3.1415926535897;

Console.WriteLine(myVar1); // Output: 3.1415927
Console.WriteLine(myVar2); // Output: 3.1415926535897

As float has a lower precision, the value 3.1415926535897 is automatically rounded off till its 7th decimal digit and the result is stored in the variable myVar1.

Like int and long, we can also perform arithmetic operations on float and double values.

main.cs

main.cs

copy

              
12345

            
float var1 = 1.14f;
double var2 = 1.00;
float var3 = 1.0f;

double var4 = var1 + var2 + var3;
question mark

Which of these is the correct declaration of a float variable?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

SectionΒ 2. ChapterΒ 3
some-alt