学生成绩管理系统c++源码大作业.zip

//学生成绩管理系统 #define _CRT_SECURE_NO_WARNINGS 1 #pragma warning(disable:6031) #include<stdio.h> #include<stdlib.h> #include<conio.h> #include<dos.h> #include<string.h> #define LEN sizeof(struct student) #define FORMAT "%-8d%-15s%-12.1lf%-12.1lf%-12.1lf%-12.1lf\n" #define DATA stu[i].num,stu[i].name,stu[i].elec,stu[i].expe,stu[i].requ,stu[i].sum struct student/*定义学生成绩结构体*/ { int num;/*学号*/ char name[15];/*姓名*/ double elec;/*选修课*/ double expe;/*实验课*/ double requ;/*必修课*/ double sum;/*总分*/ }; struct student stu[50];/*定义结构体数组*/ void in();/*录入学生成绩信息*/ void show();/*显示学生信息*/ void order();/*按总分排序*/ void del();/*删除学生成绩信息*/ void modify();/*修改学生成绩信息*/ void menu();/*主菜单*/ void insert();/*插入学生信息*/ void total();/*计算总人数*/ void search();/*查找学生信息*/ void main()/*主函数*/ { int n; menu(); scanf("%d", &n);/*输入选择功能的编号*/ while (n) { switch (n) { case 1: in(); break; case 2: search(); break; case 3: del(); break; case 4: modify(); break; case 5: insert(); break; case 6: order(); break; case 7: total(); break; default:break; } _getch(); menu();/*执行完功能再次显示菜单界面*/ scanf("%d", &n); } } void in()/*录入学生信息*/ { int i, m = 0;/*m是记录的条数*/ char ch[2]; FILE* fp;/*定义文件指针*/ if ((fp = fopen("data.txt", "a+")) == NULL)/*打开指定文件*/ { printf("can not open\n"); return; } while (!feof(fp)) { if (fread(&stu[m], LEN, 1, fp) == 1) m++;/*统计当前记录条数*/ } fclose(fp); if (m == 0) printf("No record!\n"); else { system("cls"); show();/*调用show函数，显示原有信息*/ } if ((fp = fopen("data.txt", "wb")) == NULL) { printf("can not open\n"); return; } for (i = 0; i < m; i++) fwrite(&stu[i], LEN, 1, fp);/*向指定的磁盘文件写入信息*/ printf("please input(y/n):"); scanf("%s", ch); while (strcmp(ch, "Y") == 0 || strcmp(ch, "y") == 0)/*判断是否要录入新信息*/ { printf("number:"); scanf("%d", &stu[m].num);/*输入学生学号*/ for (i = 0; i < m; i++) if (stu[i].num == stu[m].num) { printf("the number is existing,press any to continue!"); _getch(); fclose(fp); return; } printf("name:"); scanf("%s", stu[m].name);/*输入学生姓名*/ printf("elective:"); scanf("%lf", &stu[m].elec);/*输入选修课成绩*/ printf("experiment:"); scanf("%lf", &stu[m].expe);/*输入实验课成绩*/ printf("required course:"); scanf("%lf", &stu[m].requ);/*输入必修课成绩*/ stu[m].sum = stu[m].elec + stu[m].expe + stu[m].requ;/*计算出总成绩*/ if (fwrite(&stu[m], LEN, 1, fp) != 1)/*将新录入的信息写入指定的磁盘文件*/ { printf("can not save!"); _getch(); } else { printf("%s saved!\n", stu[m].name); m++; } printf("continue?(y/n):");/*询问是否继续*/ scanf("%s", ch); } fclose(fp); printf("OK!\n"); } void show() { FILE* fp; int i, m = 0; fp = fopen("data.txt", "rb"); while (!feof(fp)) { if (fread(&stu[m], LEN, 1, fp) == 1) m++; } fclose(fp); printf("number name elective experiment required sum\t\n"); for (i = 0; i < m; i++) { printf(FORMAT, DATA);/*将信息按指定格式打印*/ } } void menu()/*自定义函数实现菜单功能*/ { system("cls"); printf("\n\n\n\n\n"); printf("\t\t|---------------------STUDENT-------------------|\n"); printf("\t\t|\t 0. exit |\n"); printf("\t\t|\t 1. input record |\n"); printf("\t\t|\t 2. search record |\n"); printf("\t\t|\t 3. delete record |\n"); printf("\t\t|\t 4. modify record |\n"); printf("\t\t|\t 5. insert record |\n"); printf("\t\t|\t 6. order |\n"); printf("\t\t|\t 7. number |\n"); printf("\t\t|-----------------------------------------------|\n\n"); printf("\t\t\tchoose(0-7):"); } void order()/*自定义排序函数*/ { FILE* fp; struct student t; int i = 0, j = 0, m = 0; if ((fp = fopen("data.txt", "r+")) == NULL) { printf("can not open!\n"); return; } while (!feof(fp)) if (fread(&stu[m], LEN, 1, fp) == 1) m++; fclose(fp); if (m == 0) { printf("no record!\n"); return; } if ((fp = fopen("data.txt", "wb")) == NULL) { printf("can not open\n"); return; } for (i = 0; i < m - 1; i++) for (j = i + 1; j < m; j++)/*双重循环实现成绩比较并交换*/ if (stu[i].sum < stu[j].sum) { t = stu[i]; stu[i] = stu[j]; stu[j] = t; } if ((fp = fopen("data.txt", "wb")) == NULL) { printf("can not open\n"); return; } for (i = 0; i < m; i++)/*将重新排好序的内容重新写入指定的磁盘文件中*/ if (fwrite(&stu[i], LEN, 1, fp) != 1) { printf("%s can not save!\n"); _getch(); } fclose(fp); printf("save successfully\n"); } void del()/*自定义删除函数*/ { FILE* fp; int snum, i, j, m = 0; char ch[2]; if ((fp = fopen("data.txt", "r+")) == NULL) { printf("can not open\n"); return; } while (!feof(fp)) if (fread(&stu[m], LEN, 1, fp) == 1) m++; fclose(fp); if (m == 0) { printf("no record!\n"); return; } printf("please input the number:"); scanf("%d", &snum); for (i = 0; i < m; i++) if (snum == stu[i].num) break; printf("find the student,delete?(y/n)"); scanf("%s", ch); if (strcmp(ch, "Y") == 0 || strcmp(ch, "y") == 0)/*判断是否要进行删除*/ for (j = i; j < m; j++) stu[j] = stu[j + 1];/*将后一个记录移到前一个记录的位置*/ m--;/*记录的总个数减1*/ if ((fp = fopen("data.txt", "wb")) == NULL) { printf("can not open\n"); return; } for (j = 0; j < m; j++)/*将更改后的记录重新写入指定的磁盘文件中*/ if (fwrite(&stu[j], LEN, 1, fp) != 1) { printf("can not save!\n"); _getch(); } fclose(fp); printf("delete successfully!\n"); } void search()/*自定义查找函数*/ { FILE* fp; int snum, i, m = 0; char ch[2]; if ((fp = fopen("data.txt", "rb")) == NULL) { printf("can not open\n"); return; } while (!feof(fp)) if (fread(&stu[m], LEN, 1, fp) == 1) m++; fclose(fp); if (m == 0) { printf("no record!\n"); return; } printf("please input the number:"); scanf("%d", &snum); for (i = 0; i < m; i++) if (snum == stu[i].num)/*查找输入的学号是否在记录中*/ { printf("find the student,show?(y/n)"); scanf("%s", ch); if (strcmp(ch, "Y") == 0 || strcmp(ch, "y") == 0) { printf("number name elective experiment required sum\t\n"); printf(FORMAT, DATA);/*将查找出的结果按指定格式输出*/ break; } } if (i == m) printf("can not find the student!\n");/*未找到要查找的信息*/ } void modify()/*自定义修改函数*/ { FILE* fp; int i, j, m = 0, snum; if ((fp = fopen("data.txt", "r+")) == NULL) { printf("can not open\n"); return; } while (!feof(fp)) if (fread(&stu[m], LEN, 1