Explore the practical uses of the % operator in Go language

The % operator in Go language is used for remainder operations. Its real meaning is to help us implement some specific functions and calculations. The following is an analysis of the true meaning of the % operator, with specific code examples.

1. Remainder operation
% operator can be used for remainder operation, that is, to find the remainder after dividing one number by another number. This is very common in some mathematical calculations and algorithms. For example, to determine whether a number is even, you can divide the number by 2 and take the remainder. If the remainder is 0, the number is even; otherwise, it is odd.

Specific code example:

package main

import "fmt"

func main() {
    num1 := 10
    num2 := 2

    remainder := num1 % num2

    if remainder == 0 {
        fmt.Println(num1, "是偶数")
    } else {
        fmt.Println(num1, "是奇数")
    }
}

Run result:

10 是偶数

2. Periodic calculation
% operator can also be used for periodic calculation, that is, a number limit within a certain range. For example, if we want to limit a number to between 0 and 9, we can use the operation. This is widely used in some counters and circular queues.

Specific code example:

package main

import "fmt"

func main() {
    count := 0

    for i := 0; i < 20; i++ {
        count = i % 10
        fmt.Println(count)
    }
}

Run result:

0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9

3. Truncate the decimal part
The % operator can also be used to truncate the decimal part of a floating point number. Only the integer part is kept. This is very useful in scenarios where data needs to be rounded or truncated.

Specific code examples:

package main

import "fmt"

func main() {
    num1 := 10.5
    num2 := 3.2

    intPart1 := int(num1)
    intPart2 := int(num2)

    fmt.Println(intPart1, intPart2)
}

Run results:

10 3

Summary:
Through the above code examples, we can see that there are three main meanings of the % operator Aspects: remainder operations, periodic calculations and truncation of decimal parts. These uses are very common in actual programming and provide us with convenience and flexibility. When using the % operator, we also need to pay attention to the fact that the divisor cannot be 0, otherwise an error will occur.

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