How to use float in c language

float is the data type used to represent floating point numbers in C language, which is stored in binary format in memory. To use float, you need to declare a variable of type float, which can then be assigned a value through a literal, assignment expression, or input function. The precision of a float depends on the machine's internal representation, which is usually about 7 decimal significant digits. The C language provides a variety of floating-point operators and functions, but it is important to note that float values ​​are prone to overflow or underflow, and may not be completely equal when compared.

Usage of float in C language

What is float?

float is a data type in C language used to represent floating point numbers, that is, numbers with a decimal part. Unlike other data types, float values ​​are stored in binary format in memory, which results in some loss of precision.

Using float

To use float, you need to declare a float type variable first, as shown below:

<code class="c">float my_float;</code>

Then, you can use the following method Assign the value to the float variable:

• Literal: Write the decimal with the decimal point directly in the code, for example:

<code class="c">my_float = 3.14;</code>

• Assignment expression: Assign the value of another float variable to the current variable, for example:

<code class="c">my_float = another_float;</code>

• Input function: From the user Get a floating point number from the input, for example:

<code class="c">scanf("%f", &my_float);</code>

The precision of float

The precision of the float type is determined by the machine's internal representation. On most machines, float values ​​are stored in 32 bits, which provides a precision of approximately 7 decimal significant digits. This means that for very large or very small numbers, a loss of precision may occur.

Floating point operations

The C language provides a variety of operators and functions for performing floating point operations, including:

• Arithmetic operators: , -, *, / are used to perform addition, subtraction, multiplication and division.
• Comparison operators: ==, !=, <, <=, >, >= are used to compare floating point numbers.
• Mathematical functions: For example, sin, cos, tan, etc., used to perform trigonometric and exponential operations.

Notes

• float values ​​are prone to overflow or underflow, especially when performing large number operations.
• Unlike integer types, float values ​​may not be exactly equal when compared, due to loss of precision.
• In situations where high precision is required, you can consider using double or long double types, which provide higher precision.

The above is the detailed content of How to use float in c language. For more information, please follow other related articles on the PHP Chinese website!