Tuesday, October 27, 2020 09:26

Table of contents >> Introduction > Float variable type

Float variable type

C# language uses float variable type to store real number values in floating point (negative and positive numbers that contain a fractional part). The C# compiler will allocate 32 bits (4 bytes) to store values of type float. A float variable type can store values with a precision of six or seven decimals in the interval of 3.4E-38 and 3.4E+38.

The C# language keeps the value on a mantissa of 23 bits (which contains the fractional part) and an exponent of 8 bits (which contains the power with which the number is multiplied) and a single bit of sign (which tells the compiler if the value is positive or negative). In other words, if a variable contains the value 3.4E+38, the sign bit will be 0, which indicates a positive number, the 23 bits mantissa will contain a binary representation of number 3.4, and the 8 bit exponent will contain a binary representation of 1038

float variable type


Additional Information

This section, as many others that will follow, represents real numbers using scientific notation. This system allows to represent any number utilizing a single digit to the left of the point, an unlimited number of digits to the right of the point, and an exponent using a power of 10. When you calculate the real value of the number, multiply the number (mantissa) with the value of 10 to the power (where x represents the exponent). For instance, number 3.1415967E+7 equals to 31415967.0, or 3.1415967 * 107.

If you want a numeric real literal to be treated as float, use the suffix f or F, for example:

Without the suffix f, the number is treated as a double and generates a compiler error.

The concepts explained in this lesson are also shown visually as part of the following video:

1. Write an expression that calculates the area of a trapezoid by given sides a, b and height h.


Guidelines: The formula for trapezoid surface is: S = (a + b) * h / 2.



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