C语言经典编程实例

C语言是一种强大的编程语言,广泛应用于各行各业。以下是一些C语言经典编程实例,希望能够帮助您更好地掌握和应用C语言。

该程序可以将一个文件的内容复制到另一个文件中。它使用文件输入输出函数如fopen()、fread()和fwrite()等进行文件操作。

include <stdio.h>
include <stdlib.h>
int main(int argc, char *argv[]) {
    FILE *src, *dst;
    char buffer[1024];
    size_t bytes_read;
    if (argc != 3) {
        printf("Usage: %s <source_file> <dest_file>\n", argv[0]);
        return 1;
    }
    src = fopen(argv[1], "rb");
    if (src == NULL) {
        printf("Error opening source file: %s\n", argv[1]);
        return 1;
    }
    dst = fopen(argv[2], "wb");
    if (dst == NULL) {
        printf("Error opening destination file: %s\n", argv[2]);
        fclose(src);
        return 1;
    }
    while ((bytes_read = fread(buffer, 1, sizeof(buffer), src)) > 0) {
        if (fwrite(buffer, 1, bytes_read, dst) != bytes_read) {
            printf("Error writing to destination file\n");
            fclose(src);
            fclose(dst);
            return 1;
        }
    }
    fclose(src);
    fclose(dst);
    printf("File copied successfully\n");
    return 0;
}

链表是一种常见的数据结构,可以用C语言实现各种链表操作,如添加、删除、查找等。以下是一个简单的单链表实现示例:

include <stdio.h>
include <stdlib.h>
typedef struct Node {
    int data;
    struct Node *next;
} Node;
Node *createNode(int data) {
    Node *newNode = (Node *)malloc(sizeof(Node));
    newNode>data = data;
    newNode>next = NULL;
    return newNode;
}
void insertAtBeginning(Node **head, int data) {
    Node *newNode = createNode(data);
    newNode>next = *head;
    *head = newNode;
}
void deleteNode(Node **head, int data) {
    Node *current = *head;
    Node *prev = NULL;
    while (current != NULL) {
        if (current>data == data) {
            if (prev == NULL) {
                *head = current>next;
            } else {
                prev>next = current>next;
            }
            free(current);
            return;
        }
        prev = current;
        current = current>next;
    }
}
int main() {
    Node *head = NULL;
    insertAtBeginning(&head, 3);
    insertAtBeginning(&head, 2);
    insertAtBeginning(&head, 1);
    deleteNode(&head, 2);
    // Print the list
    Node *current = head;
    while (current != NULL) {
        printf("%d ", current>data);
        current = current>next;
    }
    printf("\n");
    return 0;
}

C语言中数组是非常常用的数据结构,以下是一些常见的数组操作示例:

include <stdio.h>
int main() {
    int arr[] = {1, 2, 3, 4, 5};
    int size = sizeof(arr) / sizeof(arr[0]);
    // 遍历数组
    printf("Array elements: ");
    for (int i = 0; i < size; i  ) {
        printf("%d ", arr[i]);
    }
    printf("\n");
    // 查找元素
    int target = 3;
    int index = 1;
    for (int i = 0; i < size; i  ) {
        if (arr[i] == target) {
            index = i;
            break;
        }
    }
    if (index != 1) {
        printf("Element %d found at index %d\n", target, index);
    } else {
        printf("Element %d not found in the array\n", target);
    }
    // 排序数组
    for (int i = 0; i < size  1; i  ) {
        for (int j = 0; j < size  i  1; j  ) {
            if (arr[j] > arr[j   1]) {
                int temp = arr[j];
                arr[j] = arr[j   1];
                arr[j   1] = temp;
            }
        }
    }
    printf("Sorted array: ");
    for (int i = 0; i < size; i  ) {
        printf("%d ", arr[i]);
    }
    printf("\n");
    return 0;
}

C语言中字符串是一种常见的数据类型,以下是一些常见的字符串操作示例:

include <stdio.h>
include <string.h>
int main() {
    char str1[] = "Hello";
    char str2[] = "World";
    // 字符串拼接
    char combined[strlen(str1)   strlen(str2)   1];
    strcpy(combined, str1);
    strcat(combined, " ");
    strcat(combined, str2);
    printf("Combined string: %s\n", combined);
    // 字符串比较
    if (strcmp(str1, str2) == 0) {
        printf("The strings are equal\n");
    } else {
        printf("The strings are not equal\n");
    }
    // 字符串长度
    printf("Length of \"%s\": %lu\n", str1, strlen(str1));
    // 字符串复制
    char copy[strlen(str1)   1];
    strcpy(copy, str1);
    printf("Copy of \"%s\": %s\n", str1, copy);
    return 0;
}

以上是一些C语言经典编程实例,涵盖了文件操作、链表、数组和字符串等常见的编程任务。这些示例可以帮助您更好地理解和应用C语言的各种功能。希望对您有所帮助。