程序代码：#include<stdio.h>voidmain(){inta=3,s=5;switch(a){case5:s=s+2;case3:s=s+5;case8:s=s+7;default:s=s+8;break;}printf("%d\n",s);}

程序代码是一组指令或命令，用于定义计算机系统执行任务或实现特定功能。程序代码可以使用各种编程语言编写，如C、C++、Java、Python等。程序代码通常由程序员编写，并通过编译器或解释器转换为机器语言，以便计算机能够理解和执行它。程序代码的质量和效率对于软件开发的成功非常重要。

相关问题

#include<stdio.h> void main) { int i=3,a=0; switch(i) { case 1:a+=1; case 2:a+=2;break; case 3:a+=3; 520 default:a +=4; } printf("%dIn",a);

这段代码也有语法错误，无法编译通过。主函数应该是`int main()`，而不是`void main()`。另外，`520`不是合法的`case`语句，应该用一个合法的值来代替。正确的代码应该是：

#include <stdio.h>

int main() {
    int i = 3, a = 0;
    switch (i) {
        case 1:
            a += 1;
        case 2:
            a += 2;
            break;
        case 3:
            a += 3;
        default:
            a += 4;
    }
    printf("%d\n", a);
    return 0;
}

这段代码的作用是根据变量`i`的值进行不同的操作，最终输出变量`a`的值。由于`i`的值为3，所以执行`case 3`后，由于没有`break`语句，会继续执行`default`语句，最终输出的结果为7。

#include<stdio.h> #include<stdlib.h> #include<string.h> #include<windows.h> struct stu { int id; char name[10]; float grade[11]; float sum; float average; float gpa; struct stu* next; };按照这个结构体来续写C语言代码。要求将学生信息保存在硬盘文件中，通过制定文件路径和文件名称来导入学生信息；按照学号对所有学生信息进行升序、降序排列，并输出到屏幕显示或输出到文件

好的，以下是续写的代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>

struct stu {
    int id;
    char name[10];
    float grade[11];
    float sum;
    float average;
    float gpa;
    struct stu* next;
};

void saveToFile(struct stu* head, char* fileName) {
    FILE* fp = fopen(fileName, "wb");
    if (fp == NULL) {
        printf("Failed to open file!\n");
        return;
    }
    struct stu* p = head;
    while (p != NULL) {
        fwrite(p, sizeof(struct stu), 1, fp);
        p = p->next;
    }
    fclose(fp);
    printf("Successfully saved to file!\n");
}

struct stu* readFromFile(char* fileName) {
    FILE* fp = fopen(fileName, "rb");
    if (fp == NULL) {
        printf("Failed to open file!\n");
        return NULL;
    }
    struct stu* head = NULL, *p = NULL, *q = NULL;
    while (!feof(fp)) {
        p = (struct stu*)malloc(sizeof(struct stu));
        if (p == NULL) {
            printf("Memory allocation failed!\n");
            return NULL;
        }
        fread(p, sizeof(struct stu), 1, fp);
        if (p->id == 0) {
            free(p);
            break;
        }
        p->next = NULL;
        if (head == NULL) {
            head = p;
        }
        else {
            q->next = p;
        }
        q = p;
    }
    fclose(fp);
    printf("Successfully read from file!\n");
    return head;
}

void printList(struct stu* head) {
    if (head == NULL) {
        printf("The list is empty!\n");
        return;
    }
    printf("ID\tName\tGrade1\tGrade2\tGrade3\tGrade4\tGrade5\tGrade6\tGrade7\tGrade8\tGrade9\tGrade10\tSum\tAverage\tGPA\n");
    struct stu* p = head;
    while (p != NULL) {
        printf("%d\t%s\t", p->id, p->name);
        for (int i = 0; i < 10; i++) {
            printf("%.2f\t", p->grade[i]);
        }
        printf("%.2f\t%.2f\t%.2f\n", p->sum, p->average, p->gpa);
        p = p->next;
    }
}

void swap(struct stu* a, struct stu* b) {
    struct stu temp = *a;
    *a = *b;
    *b = temp;
}

void sortList(struct stu* head, int order) {
    if (head == NULL) {
        printf("The list is empty!\n");
        return;
    }
    int count = 0;
    struct stu* p = head;
    while (p != NULL) {
        count++;
        p = p->next;
    }
    for (int i = 0; i < count - 1; i++) {
        p = head;
        for (int j = 0; j < count - i - 1; j++) {
            if (order == 1) {
                if (p->id > p->next->id) {
                    swap(p, p->next);
                }
            }
            else {
                if (p->id < p->next->id) {
                    swap(p, p->next);
                }
            }
            p = p->next;
        }
    }
    printf("Successfully sorted!\n");
}

int main() {
    struct stu* head = NULL;
    char fileName[100];
    int choice, order;
    while (1) {
        system("cls");
        printf("1. Import student information from file\n");
        printf("2. Save student information to file\n");
        printf("3. Print student information\n");
        printf("4. Sort student information by ID in ascending order\n");
        printf("5. Sort student information by ID in descending order\n");
        printf("6. Exit\n");
        printf("Please enter your choice: ");
        scanf_s("%d", &choice);
        switch (choice) {
        case 1:
            printf("Please enter the file path and name: ");
            scanf_s("%s", fileName, 100);
            head = readFromFile(fileName);
            Sleep(2000);
            break;
        case 2:
            printf("Please enter the file path and name: ");
            scanf_s("%s", fileName, 100);
            saveToFile(head, fileName);
            Sleep(2000);
            break;
        case 3:
            printList(head);
            system("pause");
            break;
        case 4:
            sortList(head, 1);
            system("pause");
            break;
        case 5:
            sortList(head, 2);
            system("pause");
            break;
        case 6:
            printf("Goodbye!\n");
            return 0;
        default:
            printf("Invalid choice!\n");
            Sleep(1000);
            break;
        }
    }
    return 0;
}

这段代码实现了以下功能：

1. 将学生信息保存到硬盘文件中，并通过指定文件路径和文件名称来导入学生信息。
2. 按照学号对所有学生信息进行升序、降序排列，并输出到屏幕显示或输出到文件。
3. 通过菜单的方式来选择要执行的操作。

希望对你有所帮助！