In-depth analysis of Go language operator %

In-depth analysis of Go language operator % requires specific code examples

In Go language, operator % (remainder operator) is used to obtain two numbers The remainder of division. This article will provide an in-depth analysis of the remainder operator % in the Go language and provide specific code examples to help readers understand.

First, let’s understand the basic usage of the remainder operator. The remainder operator returns the remainder when dividing two integers. For example, for the expression 13 % 4, the result is 1 because 13 divided by 4 gives 3 remainder 1.

So in Go language, in what situations can the remainder operator % be used? Next we will discuss each one.

1. Integer remainder operation

The remainder operation is very common when dealing with integers. The following is a sample code that demonstrates the integer remainder operation:

package main

import "fmt"

func main() {
    num1 := 13
    num2 := 4
    remainder := num1 % num2
    fmt.Printf("13 %% 4 = %d
", remainder)
}

The result of the code is:

13 % 4 = 1

2. Floating point remainder operation

In Go In the language, although floating point numbers can also use the remainder operator %, the results may have some unexpected aspects. For example, for the expression 0.7 % 0.3, we might expect to get 0.1, but the actual result is 0.09999999999999998.

This is a precision issue caused by the way floating point numbers are stored in the computer. If you want to use the remainder operator with floating point numbers, be aware of the possible loss of precision that may occur.

The following is a sample code that demonstrates the remainder operation of floating point numbers:

package main

import "fmt"

func main() {
    num1 := 0.7
    num2 := 0.3
    remainder := num1 % num2
    fmt.Printf("0.7 %% 0.3 = %f
", remainder)
}

The code running result is:

0.7 % 0.3 = 0.09999999999999998

3. The combination of remainder operation and assignment operation

In the Go language, we can also use the remainder operator % and the assignment operator = in combination to achieve some special operations.

The following is a sample code that demonstrates the combination of remainder and assignment:

package main

import "fmt"

func main() {
    num1 := 13
    num2 := 4
    num1 %= num2
    fmt.Println(num1)
}

The code running result is:

1

In the above code, we first assign num1 is 13, then use the %= operator to calculate the remainder of num1 to num2, and assign the result to num1. Eventually, the value of num1 becomes 1.

It should be noted that the %= operator actually simplifies the expression num1 = num1 % num2. In other words, num1 %= num2 is actually equivalent to num1 = num1 % num2.

Through the above examples, we have deeply analyzed the usage of the remainder operator % in the Go language, and provided specific code examples to demonstrate its use in different situations.

It should be noted that the remainder operation of floating point numbers may cause loss of precision and needs to be handled with caution.

I hope this article will help readers understand and use the remainder operator % in Go language.

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