An in-depth analysis of Go language operator precedence

In-depth understanding of Go language operator priority requires specific code examples

Go language is a statically typed programming language that supports concurrent programming. During the programming process, We often need to use operators to perform various calculations and operations. However, the precedence order of operators is critical to writing correct code because it directly affects how an expression evaluates. A deep understanding of Go language operator precedence can not only help us write more efficient and accurate code, but also avoid some common mistakes.

In the Go language, the priority of operators is arranged from high to low. For example, arithmetic operators have a higher priority than comparison operators, and logical operators have a higher priority than assignment operations. Fu et al. Below we use specific code examples to introduce the priority order of various operators in the Go language in detail.

The first is the arithmetic operators, including addition operator (), subtraction operator (-), multiplication operator (), division operator (/) and remainder operator (%), etc. . The order of precedence of arithmetic operators from high to low is: remainder operator (%) > multiplication operator () and division operator (/) > addition operator ( ) and subtraction operator (-). Here is a sample code:

package main

import "fmt"

func main() {
    a := 10
    b := 5
    c := 2

    result := a + b * c / 2 % 3

    fmt.Println(result)  // 输出：7
}

In the above code, we have used various arithmetic operators and done the correct calculations with precedence. According to the priority rules of arithmetic operators, the multiplication operator () and division operator (/) have higher priority than the addition operator () and subtraction operator (-), so b c is calculated first The result of / 2 is 5, then the remainder operator (%) is used to calculate the result to be 2, and finally added to a to obtain the final result of 7.

Next are comparison operators, including equal operator (==), not equal operator (!=), greater than operator (>), less than operator (<), greater than or equal to operator operator (>=) and less than or equal to operator (<=), etc. The precedence order of comparison operators is the same as that of arithmetic operators, from high to low: greater than operator (>), less than operator (<), greater than or equal to operator (>=), and less than or equal to Operator (<=) > Equality operator (==) and Inequality operator (!=). Here is a sample code:

package main

import "fmt"

func main() {
    a := 10
    b := 20
    c := 30

    result := a < b && b > c || a == c

    fmt.Println(result)  // 输出：false
}

In the above code, we have used comparison operators and done the correct comparison by precedence. According to the precedence rules of comparison operators, the greater than operator (>) and less than operator (<) have higher precedence than the equal operator (>=) and the less than or equal operator (<=), so first The result of calculating b > c is false, and then comparing with a, the result is false. Finally, logical operations are performed through the logical operators && and ||, and the final result is false.

The last one is the assignment operator, including simple assignment operator (=), plus and equal operator (=), minus and equal operator (-=), multiplication and equal operator (*=), etc. The assignment operator has the lowest precedence of all operators, so the assignment operator with the lowest precedence in an expression is always evaluated last. Here is a sample code:

package main

import "fmt"

func main() {
    a := 10
    b := 20
    c := 30

    result := a + b - c

    fmt.Println(result)  // 输出：0

    result += 5

    fmt.Println(result)  // 输出：5

    result *= 2

    fmt.Println(result)  // 输出：10
}

In the above code, we have used the assignment operator and performed the correct assignment through priority. First calculate a b to get the result 30, then subtract c to get the result 0, then use the assignment operator = to add 5 to the result, get the result 5, and finally use the assignment operator *= to multiply the result by 2, get the final result 10.

Through the above code examples, we can have a deeper understanding of the priority order of various operators in the Go language, and learn how to correctly use the and operators to write efficient and accurate code. In the programming process, reasonable application of operator precedence rules can not only improve the efficiency of the code, but also avoid some potential errors. Programming requires continuous learning and practice. I hope this article will be helpful to you.

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