C语言怎么实现班级档案管理系统

#include<stdio.h>#include<stdlib.h>#include<string.h>#define N 20struct student{ long num; char name[20]; char sex[10]; int age; char bz[40]; struct student *next;};int i,j,n,num2,num3,age3,k,m;char name3[20],sex3[20],bz3[20],ch;FILE *fp;int login() //登陆函数{ char key[20]; printf("\t ********************请输入系统密码********************\n"); do { scanf("%s",key); if((strcmp("a",key))==0) { printf("\t password correct ,welcome !\n"); return 1; //当密码正确时，返回1，进入系统 } printf("\t password incorrect,please input again!\n"); }while(key!=1);//当返回值不为1时，重新输入密码，直到输入真确为止 system("cls");}int menu() //菜单{ int c; printf("\t\t**********欢迎进入通讯客户端！************\n\n"); printf("\t\t|—————1.录入学生的基本信息—————|\n"); printf("\t\t|----------2.显示学生的基本信息----------|\n"); printf("\t\t|----------3.保存学生的基本信息----------|\n"); printf("\t\t|----------4.删除学生的基本信息----------|\n"); printf("\t\t|----------5.修改学生的基本信息----------|\n"); printf("\t\t|----------6.查询学生的基本信息----------|\n"); printf("\t\t|—————7.退出系统——————————|\n"); printf("\t\t请选择您要进行的功能(0~7) "); scanf("%d",&c); return c;}struct student *creat() //录入信息函数{ struct student *head,*p1,*p2; n=0; p1=p2=(struct student *)malloc(sizeof(struct student)); head=NULL; printf("请输入学生信息学号，姓名，性别，年龄，备注（键入学生学号为0时结束）\n"); while(1) //为1表真，p2->next不为0； { scanf("%d",&p1->num); if(p1->num==0) //判断学生的学号是否为0，如果为0则停止输入数据； { break; } scanf("%s%s%d%s",p1->name,p1->sex,&p1->age,p1->bz); n=n+1; if(n==1) { head=p1; } else { p2->next=p1; } p2=p1; p1=(struct student *)malloc(sizeof(struct student)); } p2->next=NULL; system("cls"); return(head);}void print(struct student *head) //输出信息函数{ struct student *p; printf("\t\t这里有 %d 个学生的数据信息\n",n); p=head; if(head!=NULL) { do { printf("\t\t学号:%d\t姓名:%s\t性别:%s\t年龄:%d\t备注:%s\n",p->num,p->name,p->sex,p->age,p->bz); p=p->next; }while(p!=NULL); } else { return 0; } printf("\n");}int save(struct student *p) //保存信息函数{ FILE *fp; if((fp=fopen("keshe.txt","wb"))==NULL) { printf("open file fail\n"); } fp=fopen("stud","wb"); do { fwrite(p,sizeof(struct student),1,fp); p=p->next; }while(p!=NULL); printf("\t\t\t保存成功!\n"); fclose(fp); return 0;}struct student *del(struct student *head){ struct student *p1,*p2; printf("\t\t请输入要删除学生的学号\n"); scanf("%d",&num2); p1=head; if(head->num==num2) { head=head->next; free(p1); n--; } else { p2=head; while(p2->num!=num2&&p2->next!=NULL) { p1=p2; p2=p2->next; } if(p2->num==num2) { p1->next=p2->next; n--; } printf("delete:%ld\n",num2); } return (head);}int mod(struct student *head); //修改信息函数struct student *modify(struct student *head){ if(login()==0) { return 0; } else { struct student *p1; j=0; p1=(struct student *)malloc(sizeof(struct student)); printf("\t\t\t请输入你要更改的学号\n"); scanf("%d",&num2); printf("\t\t\t学号\n"); scanf("%d",&num3); printf("\t\t\t姓名\n"); scanf("%s",name3); printf("\t\t\t性别\n"); scanf("%s",sex3); printf("\t\t\t年龄\n"); scanf("%d",&age3); printf("\t\t\t备注\n"); scanf("%s",bz3); p1=head; if(head->num==num2) { head->num=num3; strcpy(head->name,name3); strcpy(head->sex,sex3); head->age=age3; strcpy(head->bz,bz3); j=1; } else { p1=head->next; if(p1!=NULL) { while(p1->num!=num2) { p1=p1->next; } p1->num=num2; strcpy(p1->name,name3); strcpy(p1->sex,sex3); p1->age=age3; strcpy(p1->bz,bz3); j=1; } } if(j==0) { printf("\t\t\t更改失败\n"); } else { printf("\t\t\t更改成功\n"); } } system("cls"); mod(head);}int mod(struct student *head){ printf("\t\t\t请选择\n"); printf("\t\t\t1:按学号修改学生信息\n"); printf("\t\t\t2:输出修改后的学生信息\n"); printf("\t\t\t3:返回主菜单\n"); scanf("%d",&m); switch(m) { case 1:head=modify(head);break; case 2:print(head);break; case 3:menu();break; default:printf("\t\t\tinput error!\n"); mod(head); }}int find(struct student *head);int find1(struct student *head) //以学号方式查找{ struct student *p1; p1=(struct student *)malloc(sizeof(struct student)); printf("\t\t\t请输入你要查询的学生学号\n"); scanf("%d",&num2); p1=head; while(p1!=NULL) { if(p1->num==num2) { k=1; printf("\t\t\t学号:%d\t姓名:%s\t性别:%s\t年龄:%d\t备注:%s\n\n",p1->num,p1->name,p1->sex,p1->age,p1->bz); break; } p1=p1->next; } if(k==0) { printf("\t\t\t没有查询到您要找的学生信息\n\n"); } else { printf("\t\t\t这就是您要找的学生信息\n\n"); } find(head);}int find2(struct student *head) //以姓名方式查找{ struct student *p1; p1=(struct student *)malloc(sizeof(struct student)); printf("\t\t\t请输入您要查询的学生姓名\n"); scanf("%s",name3); p1=head; while(p1!=NULL) { if((strcmp(p1->name,name3))==0) { k=1; printf("\t\t\t学号:%d\t姓名:%s\t性别:%s\t年龄:%d\t备注:%s\n\n",p1->num,p1->name,p1->sex,p1->age,p1->bz); break; } p1=p1->next; } if(k==0) { printf("\t\t\t没有找到该学生信息\n\n"); } else { printf("\t\t\t这就是您要查询的学生信息\n\n"); } find(head);}int find3(struct student *head) //以性别方式查找{ struct student *p1; p1=(struct student *)malloc(sizeof(struct student)); printf("\t\t\t请输入你要查询的学生的性别\n"); scanf("%s",sex3); p1=head; while(p1!=NULL) { if((strcmp(p1->sex,sex3))==0) { k=1; printf("\t\t\t学号:%d\t姓名:%s\t性别:%s\t年龄:%d\t备注:%s\n\n",p1->num,p1->name,p1->sex,p1->age,p1->bz); break; } p1=p1->next; } if(k==0) { printf("\t\t\t没有找到该学生信息\n\n"); } else { printf("\t\t\t这就是您要查询的学生的信息\n\n"); } find(head);}int find4(struct student *head) //以年龄方式查找{ struct student *p1; p1=(struct student *)malloc(sizeof(struct student)); printf("\t\t\t请输入您要查询的学生的年龄\n"); scanf("%d",&age3); p1=head; while(p1!=NULL) { if(p1->age==age3) { k=1; printf("\t\t\t学号:%d\t姓名:%s\t性别:%s\t年龄:%d\t备注:%s\n\n",p1->num,p1->name,p1->sex,p1->age,p1->bz); break; } p1=p1->next; } if(k==0) { printf("\t\t\t没有找到该学生的信息\n\n"); } else { printf("\t\t\t这就是您要找的学生的信息\n\n"); } find(head);}int find(struct student *head){ printf("\t\t\t请选择您要查询学生信息的方式\n"); printf("\t\t\t1:按学生学号查询\n"); printf("\t\t\t2:按学生姓名查询\n"); printf("\t\t\t3:按学生性别查询\n"); printf("\t\t\t4:按学生年龄查询\n"); printf("\t\t\t5:返回主菜单\n"); scanf("%d",&m); switch(m) { case 1:find1(head);break; case 2:find2(head);break; case 3:find3(head);break; case 4:find4(head);break; case 5:system("cls");menu();break; default:printf("\t\t\tinput error,please input again\n"); }}int main() //主函数{ struct student *phead; if(login()==0) { return 0; } printf("\n"); while(1) { switch(menu()) { case 1:system("cls");phead=creat();break; case 2:system("cls");print(phead);break; case 3:system("cls");save(phead);break; case 4:system("cls");phead=del(phead);break; case 5:system("cls");mod(phead);break; case 6:system("cls");find(phead);break; case 7:system("cls");printf("\t\t\t欢迎使用，再见！\n");return 0; default:printf("\t\t\t输入有错，请重新输入\n"); } }}

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