学生信息管理系统

先决条件： C/C++ 中的 Switch Case问题陈述：编写一个程序来构建一个简单的学生信息管理系统软件，该软件可以执行以下操作：

1. 存储学生的名字。
2. 存储学生的姓氏。
3. 存储每个学生的唯一卷号。
4. 存储每个学生的 CGPA。
5. 存储学生注册的课程。

方法：这个想法是为每个操作形成一个单独的功能。所有的功能都统一在一起形成软件。

1. 添加学生详细信息：从用户获取数据并将学生添加到学生列表中。在将学生添加到列表中时，检查卷号的唯一性。
2. 按给定卷号查找学生：此函数是查找给定卷号的学生记录并打印详细信息。
3. 按给定名字查找学生：此函数是查找具有给定名字的所有学生并打印他们的详细信息。
4. 查找已注册课程的学生：此函数是查找已注册给定课程的所有学生。
5. 学生人数：此函数是打印系统中的学生总数
6. 删除学生：此函数是删除给定卷号的学生记录。
7. 更新学生：此函数是更新学生记录。此函数不会要求所有字段的新详细信息，但用户应该能够选择他想要更新的内容。

Add

// Function to add the student into the database
void add_student()
{
 
    printf("Add the Students Details\n");
    printf("-------------------------\n");
    printf("Enter the first name of student\n");
 
    // First name of the student
    st[i].fname = "Rahul";
    printf("Enter the last name of student\n");
 
    // Last name of the student
    st[i].lname = "Kumar";
    printf("Enter the Roll Number\n");
 
    // Roll Number of the student
    st[i].roll = 1;
    printf("Enter the CGPA you obtained\n");
 
    // CGPA of the student
    st[i].cgpa = 8;
    printf("Enter the course ID"
           " of each course\n");
 
    // Storing the courses every student
    // is enrolled in
    for (int j = 0; j < 5; j++) {
        st[i].cid[j] = j;
    }
    i = i + 1;
}

Find by Roll No

// Function to find the details
// of the student by roll number
void find_rl()
{
    int x;
    printf("Enter the Roll Number"
           " of the student\n");
 
    // Roll number for which the details
    // needs to be found
    x = 1;
 
    // Iterating through all the students
    for (int j = 0; j < i; j++) {
 
        // If the roll number is found
        if (x == st[j].roll) {
            printf("The Students Details are\n");
            printf("The First name is %s\n",
                   st[j].fname);
            printf("The Last name is %s\n",
                   st[j].lname);
            printf("The CGPA is %f\n",
                   st[j].cgpa);
 
            // Printing the courses
            // in which the student
            // is enrolled
            for (int k = 0; k < 5; k++) {
                printf(
                    "The course ID are %d\n",
                    st[j].cid[k]);
            }
            break;
        }
    }
}

Find by Name

// Function to search the students list
// by the given first name
void find_fn()
{
    char a[50];
    printf("Enter the First Name"
           " of the student\n");
    a = "Rahul";
    int c = 0;
 
    // Iterating through the students list
    for (int j = 0; j <= i; j++) {
 
        // Compare the first names
        if (!strcmp(st[j].fname, a)) {
 
            printf(
                "The Students Details are\n");
            printf(
                "The First name is %s\n",
                st[j].fname);
            printf(
                "The Last name is %s\n",
                st[j].lname);
            printf(
                "The Roll Number is %d\n ",
                st[j].roll);
            printf(
                "The CGPA is %f\n",
                st[j].cgpa);
            printf("Enter the course ID "
                   "of each course\n");
 
            // Print the course ID's
            for (int k = 0; k < 5; k++) {
                printf(
                    "The course ID are %d\n",
                    st[j].cid[k]);
            }
            c = 1;
        }
    }
}

Find registered student

// Function to find all the students
// who have registered for a given course
void find_c()
{
    int id;
    printf("Enter the course ID \n");
 
    // Course ID
    id = 1;
    int c = 0;
 
    // Iterating through the students list
    for (int j = 0; j <= i; j++) {
 
        // Checking if the student
        // has registered in the
        // given course or not
        for (int d = 0; d < 5; d++) {
            if (id == st[j].cid[d]) {
 
                printf(
                    "The Students Details are\n");
                printf(
                    "The First name is %s\n",
                    st[j].fname);
                printf(
                    "The Last name is %s\n",
                    st[j].lname);
                printf(
                    "The Roll Number is %d\n ",
                    st[j].roll);
                printf(
                    "The CGPA is %f\n",
                    st[j].cgpa);
 
                c = 1;
                break;
            }
        }
    }
}

Count

// Function to print the
// total number of students
void tot_s()
{
    printf("The total number of"
           " Student is %d\n",
           i);
    printf("\n you can have a "
           "max of 50 students\n");
    printf("you can have %d more"
           " students\n",
           50 - i);
}

Delete

// Function to delete a student
// by the roll number
void del_s()
{
    int a;
    printf("Enter the Roll Number"
           " which you want to delete\n");
    a = 1;
 
    // Iterating through the list and
    // find the student with the given
    // roll number
    for (int j = 0; j <= i; j++) {
        if (a == st[j].roll) {
            for (int k = j; k < 49; k++)
                st[k] = st[k + 1];
            i--;
        }
    }
    printf("The Roll Number is "
           "removed Successfully\n");
}

Update

// Function to update the
// details of the student
void up_s()
{
 
    printf("Enter the roll number"
           " to update the entry: ");
    long int x;
    x = 1;
    for (int j = 0; j < i; j++) {
        if (st[j].roll == x) {
 
            printf("1. first name\n"
                   "2. last name\n"
                   "3. roll no.\n"
                   "4. CGPA\n"
                   "5. courses\n");
            int z;
 
            // Updating the CGPA
            z = 4;
            switch (z) {
            case 1:
                printf("Enter the new
 first name : \n");
                scanf("%s", st[j].fname);
                break;
            case 2:
                printf("Enter the new
 last name : \n");
                scanf("%s", st[j].lname);
                break;
            case 3:
                printf("Enter the new
 roll number : \n");
                scanf("%d", &st[j].roll);
                break;
            case 4:
                printf("Enter the new CGPA : \n");
                st[j].cgpa = 9;
                break;
            case 5:
                printf("Enter the new courses \n");
                scanf("%d%d%d%d%d", &st[j].cid[0],
                      &st[j].cid[1], &st[j].cid[2],
                      &st[j].cid[3], &st[j].cid[4]);
                break;
            }
            printf("UPDATED SUCCESSFULLY.\n");
        }
    }
}

下面是上述方法的实现：

C

// C program for the implementation of
// menu driven program for student
// management system
#include 
#include 
#include 
#include 
 
// Variable to keep track of
// number of students
int i = 0;
 
// Structure to store the student
struct sinfo {
    char fname[50];
    char lname[50];
    int roll;
    float cgpa;
    int cid[10];
} st[55];
 
// Function to add the student
void add_student()
{
 
    printf("Add the Students Details\n");
    printf("-------------------------\n");
    printf("Enter the first "
           "name of student\n");
    scanf("%s", st[i].fname);
    printf("Enter the last name"
           " of student\n");
    scanf("%s", st[i].lname);
    printf("Enter the Roll Number\n");
    scanf("%d", &st[i].roll);
    printf("Enter the CGPA "
           "you obtained\n");
    scanf("%f", &st[i].cgpa);
    printf("Enter the course ID"
           " of each course\n");
    for (int j = 0; j < 5; j++) {
        scanf("%d", &st[i].cid[j]);
    }
    i = i + 1;
}
 
// Function to find the student
// by the roll number
void find_rl()
{
    int x;
    printf("Enter the Roll Number"
           " of the student\n");
    scanf("%d", &x);
    for (int j = 1; j <= i; j++) {
        if (x == st[i].roll) {
            printf(
                "The Students Details are\n");
            printf(
                "The First name is %s\n",
                st[i].fname);
            printf(
                "The Last name is %s\n",
                st[i].lname);
            printf(
                "The CGPA is %f\n",
                st[i].cgpa);
            printf(
                "Enter the course ID"
                " of each course\n");
        }
        for (int j = 0; j < 5; j++) {
            printf(
                "The course ID are %d\n",
                st[i].cid[j]);
        }
        break;
    }
}
 
// Function to find the student
// by the first name
void find_fn()
{
    char a[50];
    printf("Enter the First Name"
           " of the student\n");
    scanf("%s", a);
    int c = 0;
 
    for (int j = 1; j <= i; j++) {
        if (!strcmp(st[j].fname, a)) {
 
            printf(
                "The Students Details are\n");
            printf(
                "The First name is %s\n",
                st[i].fname);
            printf(
                "The Last name is %s\n",
                st[i].lname);
            printf(
                "The Roll Number is %d\n ",
                st[i].roll);
            printf(
                "The CGPA is %f\n",
                st[i].cgpa);
            printf(
                "Enter the course ID of each course\n");
 
            for (int j = 0; j < 5; j++) {
                printf(
                    "The course ID are %d\n",
                    st[i].cid[j]);
            }
            c = 1;
        }
        else
            printf(
                "The First Name not Found\n");
    }
}
 
// Function to find
// the students enrolled
// in a particular course
void find_c()
{
    int id;
    printf("Enter the course ID \n");
    scanf("%d", &id);
    int c = 0;
 
    for (int j = 1; j <= i; j++) {
        for (int d = 0; d < 5; d++) {
            if (id == st[j].cid[d]) {
 
                printf(
                    "The Students Details are\n");
                printf(
                    "The First name is %s\n",
                    st[i].fname);
                printf(
                    "The Last name is %s\n",
                    st[i].lname);
                printf(
                    "The Roll Number is %d\n ",
                    st[i].roll);
                printf(
                    "The CGPA is %f\n",
                    st[i].cgpa);
 
                c = 1;
 
                break;
            }
            else
                printf(
                    "The First Name not Found\n");
        }
    }
}
 
// Function to print the total
// number of students
void tot_s()
{
    printf("The total number of"
           " Student is %d\n",
           i);
    printf("\n you can have a "
           "max of 50 students\n");
    printf("you can have %d "
           "more students\n",
           50 - i);
}
 
// Function to delete a student
// by the roll number
void del_s()
{
    int a;
    printf("Enter the Roll Number"
           " which you want "
           "to delete\n");
    scanf("%d", &a);
    for (int j = 1; j <= i; j++) {
        if (a == st[j].roll) {
            for (int k = j; k < 49; k++)
                st[k] = st[k + 1];
            i--;
        }
    }
    printf("The Roll Number"
           " is removed Successfully\n");
}
 
// Function to update a students data
void up_s()
{
 
    printf("Enter the roll number"
           " to update the entry : ");
    long int x;
    scanf("%ld", &x);
    for (int j = 0; j < i; j++) {
        if (st[j].roll == x) {
            printf("1. first name\n"
                   "2. last name\n"
                   "3. roll no.\n"
                   "4. CGPA\n"
                   "5. courses\n");
            int z;
            scanf("%d", &z);
            switch (z) {
            case 1:
                printf("Enter the new "
                       "first name : \n");
                scanf("%s", st[j].fname);
                break;
            case 2:
                printf("Enter the new "
                       "last name : \n");
                scanf("%s", st[j].lname);
                break;
            case 3:
                printf("Enter the new "
                       "roll number : \n");
                scanf("%d", &st[j].roll);
                break;
            case 4:
                printf("Enter the new CGPA : \n");
                scanf("%f", &st[j].cgpa);
                break;
            case 5:
                printf("Enter the new courses \n");
                scanf(
                    "%d%d%d%d%d", &st[j].cid[0],
                    &st[j].cid[1], &st[j].cid[2],
                    &st[j].cid[3], &st[j].cid[4]);
                break;
            }
            printf("UPDATED SUCCESSFULLY.\n");
        }
    }
}
 
// Driver code
void main()
 
{
    int choice, count;
    while (i = 1) {
        printf("The Task that you "
               "want to perform\n");
        printf("1. Add the Student Details\n");
        printf("2. Find the Student "
               "Details by Roll Number\n");
        printf("3. Find the Student "
               "Details by First Name\n");
        printf("4. Find the Student "
               "Details by Course Id\n");
        printf("5. Find the Total number"
               " of Students\n");
        printf("6. Delete the Students Details"
               " by Roll Number\n");
        printf("7. Update the Students Details"
               " by Roll Number\n");
        printf("8. To Exit\n");
        printf("Enter your choice to "
               "find the task\n");
        scanf("%d", &choice);
        switch (choice) {
        case 1:
            add_student();
            break;
        case 2:
            find_rl();
            break;
        case 3:
            find_fn();
            break;
        case 4:
            find_c();
            break;
        case 5:
            tot_s();
            break;
        case 6:
            del_s();
            break;
        case 7:
            up_s();
            break;
        case 8:
            exit(0);
            break;
        }
    }
}

输出：您要执行的任务 1. 添加学生详细信息 2. 按卷号查找学生详细信息 3. 按名字查找学生详细信息 4. 按课程 ID 查找学生详细信息 5. 查找学生总数6. 按卷号删除学生详细信息 7. 按卷号更新学生详细信息 8. 退出 输入您的选择以查找任务 1 添加学生详细信息 —————————- 输入学生 Rahul 的名字输入学生 Kumar 的姓 输入卷号 1 输入您获得的 CGPA 8 输入每门课程的课程 ID 1 2 3 4 5 您要执行的任务 1. 添加学生详细信息 2. 通过以下方式查找学生详细信息卷号 3. 按名字查找学生详细信息 4. 按课程 ID 查找学生详细信息 5. 查找学生总数 6. 按卷号删除学生详细信息 7. 按卷号更新学生详细信息 8. 退出输入您的选择以查找任务 2 输入学生的卷号 1 The Students Det ails 是 名字是 Rahul 姓氏是 Kumar CGPA 是 8.000000 输入每门课程的课程 ID 课程 ID 是 1 课程 ID 是 2 课程 ID 是 3 课程 ID 是 4 课程 ID 是 5 任务1. 添加学生详细信息 2. 按卷号查找学生详细信息 3. 按名字查找学生详细信息 4. 按课程 ID 查找学生详细信息 5. 查找学生总数 6. 删除按卷号的学生详细信息 7. 按卷号更新学生详细信息 8. 退出 输入您的选择以查找任务 3 输入学生的名字 Rahul 学生详细信息是 名字是 Rahul 姓氏是 Kumar The Roll编号为 1 CGPA 为 8.000000 输入每门课程的课程 ID 课程 ID 为 1 课程 ID 为 2 课程 ID 为 3 课程 ID 为 4 课程 ID 为 5 您要执行的任务 1. 添加学生详细信息 2. 按卷号查找学生详细信息 3. 查找学生详细信息 b y 名字 4. 按课程 ID 查找学生详细信息 5. 查找学生总数 6. 按卷号删除学生详细信息 7. 按卷号更新学生详细信息 8. 退出 输入您的选择以查找任务 4输入课程 ID 1 学生详细信息是 名字是 Rahul 姓氏是 Kumar 卷号是 1 CGPA 是 8.000000 您要执行的任务 1. 添加学生详细信息 2. 按卷号查找学生详细信息3. 按名字查找学生详细信息 4. 按课程 ID 查找学生详细信息 5. 查找学生总数 6. 按卷号删除学生详细信息 7. 按卷号更新学生详细信息 8. 退出 输入您的选择查找任务 5 学生总数为 1 您最多可以有 50 个学生 您可以再有 49 个学生 您要执行的任务 1. 添加学生详细信息 2. 按卷号查找学生详细信息. 按名字查找学生详细信息 4. 查找学生详细信息s 按课程 ID 5. 查找学生总数 6. 按卷号删除学生详细信息 7. 按卷号更新学生详细信息 8. 退出 输入您的选择以查找任务 6 输入您想要的卷号删除 1 卷号已成功删除 您要执行的任务 1. 添加学生详细信息 2. 按卷号查找学生详细信息 3. 按名字查找学生详细信息 4. 按课程 ID 查找学生详细信息 5.查找学生总数 6. 按卷号删除学生详细信息 7. 按卷号更新学生详细信息 8. 退出 输入您的选择以查找任务 2 输入学生的卷号 1 课程 ID 为 0课程 ID 为 0 课程 ID 为 0 课程 ID 为 0 课程 ID 为 0 您要执行的任务 1. 添加学生详细信息 2. 按卷号查找学生详细信息 3. 按名字查找学生详细信息4. 按课程 ID 查找学生详细信息 5. 查找 S 的总数学生 6. 按卷号删除学生详细信息 7. 按卷号更新学生详细信息 8. 退出 输入您的选择以查找任务 8