c语言学生成绩管理系统(1).rar

#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 /* 【自学去】网站收集 http://www.zixue7.com */ 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,fp)==1) m++; if(m==0) {printf("no record!\n"); fclose(fp); return; } printf("please input the number of the student which do you want to modify!\n"); scanf("%d",&snum); for(i=0;i<m;i++) if(snum==stu[i].num)/*检索记录中是否有要修改的信息*/ break; printf("find the student!you can modify!\n"); printf("name:\n"); scanf("%s",stu[i].name);/*输入名字*/ printf("\nelective:"); scanf("%lf",&stu[i].elec);/*输入选修课成绩*/ printf("\nexperiment:"); scanf("%lf",&stu[i].expe);/*输入实验课成绩*/ printf("\nrequired course:"); scanf("%lf",&stu[i].requ);/*输入必修课成绩*/ stu[i].sum=stu[i].elec+stu[i].expe+stu[i].requ; if((fp=fopen("data.txt","wb"))==NULL) { printf("can not open\n");return;} for(j=0;j<m;j++)/*将新修改的信息写入指定的磁盘文件中*/ if(fwrite(&stu[j] ,LEN,1,fp)!=1) { printf("can not save!"); getch(); } fclose(fp); } void insert()/*自定义插入函数*/ { FILE *fp; int i,j,k,m=0,snum; if((fp=fopen("data.txt","r+"))==NULL) { printf("can no