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Delete '学生成绩管理系统.cpp'
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#include <stdio.h> #include <stdlib.h> #include <string.h>

typedef struct { char num[20]; // 学号 char name[10]; // 姓名 int math_score; // 高数成绩 int datastruct_score; // 数据结构成绩 int English_score; // 英语成绩 int physics_score; // 物理成绩 float average; // 平均分 } Student;

typedef struct { Student *data; int length; } funlist;

// 初始化线性表 void initlist(funlist *l) { l->data = (Student *)malloc(100 * sizeof(Student)); l->length = 0; }

// 判断是否为空表 int isempty(funlist *l) { return l->length == 0; }

// 取值 int getelem(funlist l, int i, Student *e) { if (i < 1 || i > l.length) { printf("位置不合法\n"); return 0; } *e = l.data[i - 1]; return 1; }

// 计算平均分 float calculate_average(Student *s) { return (s->math_score + s->datastruct_score + s->English_score + s->physics_score) / 4.0f; }

// 打印操作 void printlist(funlist l) { int i; printf("成绩表为:\n"); for (i = 0; i < l.length; i++) { printf("学号:%s 姓名:%s 高数:%d 数据结构:%d 英语:%d 物理:%d 平均分:%.2f\n", l.data[i].num, l.data[i].name, l.data[i].math_score, l.data[i].datastruct_score, l.data[i].English_score, l.data[i].physics_score, l.data[i].average); } }

// 查找操作(按学号查找) int locateelem1(funlist l, char *num) { int i; for (i = 0; i < l.length; i++) { if (strcmp(l.data[i].num, num) == 0) return i + 1; } return -1; }

// 查找操作(按姓名查找) int locateelem2(funlist l, char *name) { int i; for (i = 0; i < l.length; i++) { if (strcmp(l.data[i].name, name) == 0) return i + 1; } return -1; }

// 删除操作 int deleteelem(funlist *l, int i) { int j; if (i < 1 || i > l->length) { printf("位置不合法\n"); return 0; } for (j = i; j < l->length; j++) { l->data[j - 1] = l->data[j]; } l->length--; return 1; }

// 插入操作 int listinsert(funlist *l, int i, Student e) { if (i < 1 || i > l->length + 1) { printf("位置不合法\n"); return 0; } if (l->length >= 100) { printf("线性表已满\n"); return 0; } int j; for (j = l->length - 1; j >= i - 1; j--) { l->data[j + 1] = l->data[j]; } // 计算并保存平均分 e.average = calculate_average(&e); l->data[i - 1] = e; l->length++; return 1; // 返回1表示成功 }

// 按平均分排序 void sort_by_average(funlist *l) { if (l->length <= 1) return; // 无需排序

int i, j;
for (i = 0; i < l->length - 1; i++) {
    for (j = 0; j < l->length - i - 1; j++) {
        if (l->data[j].average < l->data[j + 1].average) {
            Student temp = l->data[j];
            l->data[j] = l->data[j + 1];
            l->data[j + 1] = temp;
        }
    }
}
printf("学生已按平均分降序排列\n");

}

int main() { funlist L; initlist(&L);

int choice;
char num[20];
char name[10];
int math_score;
int datastruct_score;
int English_score;
int physics_score;
int i;

printf("1.插入学生\n");
printf("2.通过学号查询学生\n");
printf("3.通过姓名查询学生\n");
printf("4.删除学生\n");
printf("5.按平均分排序学生\n");
printf("6.退出\n");

while (1) { 
    printf("请输入操作选项:");
    scanf("%d", &choice);
    switch (choice) {
        case 1: {
            Student e;
            printf("请输入姓名:");
            scanf("%s", name);
            strcpy(e.name, name);
            
            printf("请输入学号:");
            scanf("%s", num);
            strcpy(e.num, num);
            
            printf("请输入高数成绩:");
            scanf("%d", &math_score);
            e.math_score = math_score;
            
            printf("请输入数据结构成绩:");
            scanf("%d", &datastruct_score);
            e.datastruct_score = datastruct_score;
            
            printf("请输入英语成绩:");
            scanf("%d", &English_score);
            e.English_score = English_score;
            
            printf("请输入物理成绩:");
            scanf("%d", &physics_score);
            e.physics_score = physics_score;
            
            printf("请输入想插入的位置(1-%d):\n", L.length + 1);
            scanf("%d", &i);
            
            if (listinsert(&L, i, e)) {
                printf("插入成功\n");
            } else {
                printf("插入失败\n");
            }
            printlist(L);
            break;
        }
        
        case 2: {
            printf("输入想查找的学生学号:");
            scanf("%s", num);
            i = locateelem1(L, num);
            if (i != -1) {
                Student e;
                getelem(L, i, &e);
                printf("找到学生: 学号:%s 姓名:%s 平均分:%.2f\n", 
                       e.num, e.name, e.average);
            } else {
                printf("未找到学号为%s的学生\n", num);
            }
            break;
        }
        
        case 3: {
            printf("输入想查找的学生姓名:");
            scanf("%s", name);
            i = locateelem2(L, name);
            if (i != -1) {
                Student e;
                getelem(L, i, &e);
                printf("找到学生: 学号:%s 姓名:%s 平均分:%.2f\n", 
                       e.num, e.name, e.average);
            } else {
                printf("未找到姓名为%s的学生\n", name);
            }
            break;
        }
        
        case 4: {
            printf("输入想删除的学生位置:");
            scanf("%d", &i);
            if (deleteelem(&L, i)) {
                printf("删除成功\n");
            } else {
                printf("删除失败\n");
            }
            printlist(L);
            break;
        }
        
        case 5: {
            sort_by_average(&L);
            printlist(L);
            break;
        }
        
        case 6: {
            printf("退出系统\n");
            free(L.data); 
            return 0;
        }
        
        default:
            printf("无效选项,请重新输入\n");
    }
}

return 0;

}