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In this issue, the editor will bring you an analysis of how to carry out struct. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

Struct syntax

Struct is similar to the encapsulation of an object property. For example, a student may have attributes such as name, student number and so on. These attributes are encapsulated to form a structure.

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Struct object name {

Variable type 1 variable name 1

Variable type 2 variable name 2

}

The struct declaration defines a student class 1

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Struct student {

Uint grade

String name

}

Structure cannot contain itself 1

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Struct student {

Uint grade

String name

/ / student s; structure cannot contain itself

}

Structures can be nested

One structure can contain another structure inside.

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Struct student {

Uint grade

String name

}

Struct student2 {

Uint grade

String name

Student ss; / / contains another structure

}

The structure can contain its own dynamic array 1

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Struct student3 {

Uint grade

String name

The student3 [] stu;// structure can contain its own dynamic array

}

The structure can contain its own mapping mapping. one

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Struct student4 {

Uint grade

String name

Mapping (uint= > student4) studentMap

}

Struct instantiation

There are several ways to define a structure

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Struct student {

Uint grade

String name

}

/ / method 1. Assign 100s and "jackson" to student in order.

Student (100, "jackson")

/ / method 2. Assign values by name

Student ({name: "jackson", grade:100})

Complete Code 1

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Pragma solidity ^ 0.4.23

Contract structTest {

Struct student {

Uint grade

String name

/ / student s

}

Struct student2 {

Uint grade

String name

Student ss

}

Struct student3 {

Uint grade

String name

Student ss

Student3 [] stu

}

Struct student4 {

Uint grade

String name

Student ss

Student3 [] stu

Mapping (uint= > student4) studentMap

}

Function init () public pure returns (uint,string) {

Student memory s = student (100, "jackson")

Student3 [3] memory stu

Return (s.grade.name)

}

Function init2 () public pure returns (uint,string) {

Student memory s = student ({name: "jackson", grade:100})

Return (s.grade.name)

}

}

The above is the editor for you to share how to analyze struct, if you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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