c语言学生管理系统

创建结构体里面包含学生的各种信息。

struct xs {int xh;char xm[20];int gs, yy, wl;double pj;struct xs* next;
};

创建菜单

void menu()
{printf("\n************************************\n");printf("*         学生管理系统（1.0）        *\n");printf("  ************************************\n");printf("  ************************************\n");printf("*             1.创建链表             *\n");printf("*             2.显示链表             *\n");printf("*             3.保存文件             *\n");printf("*             4.读取文件             *\n");printf("*             5.系统退出             *\n");printf("  ************************************\n");printf("*          请选择操作：(1-5)         *\n");printf("  ************************************\n");
}

创建链表

struct xs* create()
{struct xs* hd = (struct xs*)malloc(sizeof(struct xs)), * p = NULL, * r = NULL;hd->next = NULL;r = hd;printf("请输入学生人数： ");scanf("%d", &rs);for (int i = 1; i <= rs; i++){printf("请输入第%d个学生成绩信息： \n", i);p = (struct xs*)malloc(sizeof(struct xs));p->next = NULL;printf("学号：");scanf("%d", &p->xh);printf("姓名：");scanf("%s", &p->xm);printf("高数：");scanf("%d", &p->gs);printf("英语：");scanf("%d", &p->yy);printf("物理：");scanf("%d", &p->wl);p->pj = (p->gs + p->yy + p->wl) / 3.0;r->next = p;r = r->next;}printf("创建链表完毕，请按任意键继续！\n");_getch();return hd;
}

打印信息

void print(struct xs* hd)
{if (hd == NULL){printf("当前链表为空，请按任意键继续！");_getch();return;}struct xs* p = hd->next;printf("   学号  姓名  高数  英语 物理  平均  \n");printf("  ************************************\n");while (p != NULL){printf("    %d%     -6s     %d     %d%     d     %.2f\n", p->xh, p->xm, p->gs, p->yy, p->wl, p->pj);p = p->next;}printf("  ************************************\n");printf("链表显示完毕，请按任意键继续！\n");_getch();
}

数据保存

void save(struct xs* hd)
{if (hd == NULL)printf("当前链表为空，请按任意键继续！");else{struct xs* p = NULL;FILE* fp = fopen("1.txt", "w");fprintf(fp, "%d\n", rs);p = hd->next;while (p != NULL){fprintf(fp, "%d%s%d%d%d%lf\n", p->xh, p->xm, p->yy, p->wl, p->pj);p = p->next;}fclose(fp);printf("数据保存结束，请按任意键继续！\n");}_getch();
}

读取文件

struct xs* read()
{struct xs* hd = (struct xs*)malloc(sizeof(struct xs)), * p = NULL, * r = NULL;FILE* fp = fopen("1.txt", "r");hd->next = NULL;r = hd;fscanf(fp, "%d\n", &rs);for (int i = 1; i <= rs; i++){p = (struct xs*)malloc(sizeof(struct xs));fscanf(fp, "%d%s%d%d%d%lf\n", &p->xh, p->xm, &p->gs, &p->yy, &p->wl, &p->pj);p->next = NULL;r->next = p;r = r->next;}printf("读取文件结束，请按任意键继续！\n");_getch();return hd;
}

释放资源

void sflb(struct xs* hd)
{struct xs* p = NULL;while (hd != NULL && hd->next != NULL){p = hd->next;hd->next = p->next;free(p);}free(hd);
}

主函数

void main()
{struct xs* head = NULL;int xz;do{system("cls");menu();scanf("%d", &xz);switch (xz){case 1:sflb(head); head = create(); break;case 2:print(head); break;case 3:save(head); break;case 4:sflb(head); head = read(); break;case 5:sflb(head);}} while (xz != 5);
}