golang integer division decimal

Golang is a popular programming language. Its built-in integer division operator directly truncates the result to the integer part, which may be difficult for beginners. So how to get decimal after integer division in Golang? This article will discuss Golang integer division and decimal operations and provide practical solutions.

Golang integer division

In Golang, the integer division operator is "/", for example, the result of 5/2 operation is 2. This integer truncation behavior is determined by Golang's type system, because the divisor and dividend are both integer types, so the result must also be of integer type.

If you want to get the decimal part, you can convert one of the operands to a floating point type, such as 5.0/2, in which case the result is 2.5.

Another solution is to use "float64" type conversion, such as 5/float64(2), which can also get the result of 2.5.

Golang decimal operation

In Golang, the default type of decimal operation is the "float64" type. Therefore, for addition, subtraction, multiplication and division of two decimals, you can directly use the " ", "-", "*" and "/" operators. For example:

var a, b, c, d float64
a = 5.0
b = 2.5
c = a + b // 结果为7.5
d = a * b // 结果为12.5

It should be noted that since floating point operations have precision issues, you need to pay attention to precision issues when performing decimal operations. For example, the following operation results:

var a, b, c float64
a = 0.1
b = 0.2
c = a + b // 结果为0.30000000000000004

When doing complex decimal operations, you need to use Golang's built-in "math" package, which contains some commonly used decimal calculation functions, such as:

import "math"
var a float64
a = math.Sin(1.0) // 求sin(1)，结果为0.8414709848078965

Customized decimal division function

In the actual process of writing code, we sometimes need to encapsulate some functions to facilitate the use of ourselves or others. Therefore, we can write a function to implement the decimal part calculation of integer division. For example:

func Divide(a, b int) float64 {
    return float64(a) / float64(b)
}

The above function takes "a" and "b" of integer type as input and converts them to floating point type for division operation. The function then returns a result of type "float64".

Through the above measures, integer division in Golang can also achieve decimal results.

Conclusion

In Golang, using the integer division operator directly will cause the result to be directly truncated to an integer, which may increase programming difficulty. However, this problem can be solved by converting one of the operands to a floating point type, or using a type conversion function. In addition, when performing decimal operations, you need to pay attention to the accuracy of floating point numbers. Writing a custom decimal division function is also a good solution to make the code cleaner and easier to understand.

The above content covers the basic knowledge and practical solutions of integer division and decimal operations in Golang. Hope this article is helpful to you.

The above is the detailed content of golang integer division decimal. For more information, please follow other related articles on the PHP Chinese website!