Revealing the secrets of C language pointers: the connection between pointers, arrays and structures

Decrypting C language pointers: the relationship between pointers and arrays and structures requires specific code examples

Introduction:
The pointer in C language is a powerful And flexible features, it allows programmers to directly manipulate computer memory addresses. The understanding of pointers is crucial to an in-depth mastery of the C language. This article will focus on the relationship between pointers, arrays, and structures, and explain their use through specific code examples.

1. The relationship between pointers and arrays:
   In C language, the array name is often interpreted as a pointer to the first element of the array. Through pointers, we can traverse the array, modify elements, etc.

The example is as follows:

#include <stdio.h>

int main() {
    int nums[] = {1, 2, 3, 4, 5};

    int *ptr = nums;  // 将数组名nums赋值给指针ptr

    printf("数组第一个元素：%d
", *ptr);  // 输出1，使用指针访问数组第一个元素

    ptr++;  // 指针自增1，指向数组第二个元素

    printf("数组第二个元素：%d
", *ptr);  // 输出2，使用指针访问数组第二个元素

    return 0;
}

In the above code, int *ptr = nums;Assign the array name nums to the pointer ptr, so that array elements can be accessed through pointers. *ptr represents the content in the memory address pointed by the pointer, that is, the element in the array.

2. The relationship between pointers and structures:
   Structure is a custom data type that can contain multiple data members of different types. Pointers can also be used to point to structures, and structure members can be accessed and modified through pointers.

The example is as follows:

#include <stdio.h>

struct Student {
    char name[20];
    int age;
};

int main() {
    struct Student stu1 = {"Alice", 18};

    struct Student *ptr = &stu1;  // 将结构体stu1的地址赋值给指针ptr

    printf("姓名：%s
", ptr->name);  // 输出stu1结构体的name成员

    printf("年龄：%d
", ptr->age);  // 输出stu1结构体的age成员

    return 0;
}

In the above code, struct Student *ptr = &stu1;Assign the address of the structure stu1 Give the pointer ptr so that you can access the structure members through the pointer. ptr->name represents the name member in the structure pointed to by the pointer, ptr->age represents the # member in the structure pointed to by the pointer. ##age members.

Conclusion:

Pointers play a vital role in the C language. Its relationship with arrays and structures allows us to operate memory more flexibly. Through the specific code examples in this article, we have a deeper understanding of the relationship between pointers, arrays, and structures. I hope that by studying this article, readers can become more proficient in using pointers to solve practical problems and improve programming efficiency.

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