学生信息管理系统

#include<stdio.h>
const int maxn=1e5;
struct student
{
char num[10];       /*学号*/
char name[15];      /*姓名*/
int cgrade;         /*C语言成绩*/
int mgrade;         /*数学成绩*/
int egrade;         /*英语成绩*/
int total;          /*总分*/
float ave;          /*平均分*/
int mingci;         /*名次*/
struct student *next;
};

void print() {
printf("           The students' Grade Management System\n");
for(int i=0;i<25;i++) printf("*");
printf("Mune");
for(int i=0;i<25;i++) printf("*");
printf("\n");
printf("*   1 input record\t\t2 delete record      *\n");
printf("*   3 search record\t\t4 modify record      *\n");
printf("*   5 insert record\t\t6 count record       *\n");
printf("*   7 sort record\t\t8 save record        *\n");
printf("*   9 display record\t\t0 quit record        *\n");

}

struct student *inputs(struct student*head) {
struct student *p=NULL,*pr=head;
p=(struct student*) malloc(sizeof(struct student));
if(p==NULL) {
printf("No enough memory to allocate!\n");
exit(0);
}
if(head==NULL) head=p;
else {
while(pr->next!=NULL) pr=pr->next;
pr->next=p;
}
printf("Input student information:\n");
printf("Please input student's number:");
scanf("%s",&p->num);
printf("Please input student's name:");
scanf("%s",&p->name);
printf("Please input student's C launage grade:");
scanf("%d",&p->cgrade);
printf("Please input student's Math grade:");
scanf("%d",&p->mgrade);
printf("Please input student's English grade:");
scanf("%d",&p->egrade);
printf("Please input student's rank:");
scanf("%d",&p->mingci);
p->total=p->cgrade+p->mgrade+p->egrade;
p->ave=(double)p->total/3.0;
//printf("%d %d %d\n",p->cgrade,p->mgrade,p->egrade);
p->next=NULL;
printf("You have input the student's information successful!\n");
return head;
}

struct student *deletes(struct student*head) {
printf("Please input the student's name which you want to delect:");
char delect_name[15];
scanf("%s",&delect_name);
struct student *p=head,*pr=NULL;
if(head==NULL) {
printf("Student's information is empty!\n");
return (head);
}
while(strcmp(delect_name,p->name)&&p->next!=NULL) {
pr=p;
p=p->next;
}
if(strcmp(delect_name,p->name)==0) {
if(p==head) head=p->next;
else pr->next=p->next;
free(p);
printf("The student information has been deleted\n");
}
else printf("This student has not been found!\n");
return head;
}

void searchs(struct student*head) {
printf("Please input the student's name which you want to search:");
char search_name[15];
scanf("%s",&search_name);
struct student *p=head;
if(head==NULL) {
printf("Student's information is empty!\n");
return head;
}
while(strcmp(search_name,p->name)==0&&p->next!=NULL) {
p=p->next;
}
if(strcmp(search_name,p->name)==0) {
printf("The student's number is%s\n",p->num);
printf("The student's number C language grade is %d\n",p->cgrade);
printf("The student's number Math grade is %d\n",p->mgrade);
printf("The student's number English grade is %d\n",p->egrade);
printf("The student's number total grade is %d\n",p->total);
printf("The student's number average grade is %f\n",p->ave);
printf("The student's number rank is %d\n",p->mingci);
}
else printf("This student has not been found!\n");
return head;
}

struct student *modifys(struct student*head) {
printf("Please input the student's name which you want to modify:");
char modify_name[15];
scanf("%s",&modify_name);
struct student *p=head,*pr=NULL;
if(head==NULL) {
printf("Student's information is empty!\n");
return (head);
}
while(strcmp(modify_name,p->name)&&p->next!=NULL) {
p=p->next;
}
if(strcmp(modify_name,p->name)==0) {
printf("Please input the information you want to modify:");
printf("\n1.number\t2.name\n");
printf("3.C language grade\t4.Math grade\n");
printf("5.English grade\t6.rank\n");
int modify_number;
scanf("%d",&modify_number);
if(modify_number==1) {
printf("Please input the new number:");
char new_number[20];
scanf("%s",&new_number);
strcpy(p->num,new_number);
//p->num=new_number;
printf("The student's information modify successful\n");
}
else if(modify_number==2) {
printf("Please input the new name:");
char new_name[20];
scanf("%s",&new_name);
strcpy(p->name,new_name);
//p->name=new_name;
printf("The student's information modify successful\n");
}
else if(modify_number==3) {
printf("Please input the new C language grade:");
int new_grade;
scanf("%d",&new_grade);
p->cgrade=new_grade;
p->total=p->cgrade+p->mgrade+p->egrade;
p->ave=(double)p->total/3.0;
printf("The student's information modify successful\n");
}
else if(modify_number==4) {
printf("Please input the new Math grade:");
int new_grade;
scanf("%d",&new_grade);
p->mgrade=new_grade;
p->total=p->cgrade+p->mgrade+p->egrade;
p->ave=(double)p->total/3.0;
printf("The student's information modify successful\n");
}
else if(modify_number==5) {
printf("Please input the new English grade:");
int new_grade;
scanf("%d",&new_grade);
p->egrade=new_grade;
p->total=p->cgrade+p->mgrade+p->egrade;
p->ave=(double)p->total/3.0;
printf("The student's information modify successful\n");
}
else if(modify_number==6) {
printf("Please input the new rank:");
int new_rank;
scanf("%d",&new_rank);
p->mingci=new_rank;
printf("The student's information modify successful\n");
}
}
else printf("This student has not been found!\n");
return head;
}

struct student *inserts(struct student*head) {
printf("Please input the name do you want do insert:");
char insert_name[20];
scanf("%s",&insert_name);
printf("Please input the name do you want to insert the %s after:",insert_name);
char after_name[20];
scanf("%s",&after_name);
struct student *p=NULL,*pr=head,*temp=NULL;
p=(struct student*) malloc(sizeof(struct student));
if(head==NULL) {
printf("Student's information is empty!\n");
return (head);
}
printf("Input student information:\n");
printf("Please input student's number:");
scanf("%s",&p->num);
printf("Please input student's name:");
scanf("%s",&p->name);
printf("Please input student's C launage grade:");
scanf("%d",&p->cgrade);
printf("Please input student's Math grade:");
scanf("%d",&p->mgrade);
printf("Please input student's English grade:");
scanf("%d",&p->egrade);
printf("Please input student's rank:");
scanf("%d",&p->mingci);
p->total=p->cgrade+p->mgrade+p->egrade;
p->ave=(double)p->total/3.0;
p->next=NULL;
printf("You have input the student's information successful!\n");
while(strcmp(after_name,pr->name)!=0&&pr->next!=NULL) {
pr=pr->next;
}
if(strcmp(after_name,pr->name)==0) {
p->next=pr->next;
pr->next=p;
}
else printf("This student has not been found!\n");
return head;
}

void counts(struct student*head) {
struct student *p=head;
if(head==NULL) {
printf("student's information is empty!\n");
return (head);
}
int cgrades=0,mgrades=0,egrades=0;
while(p!=NULL) {
cgrades+=p->cgrade;
mgrades+=p->mgrade;
egrades+=p->egrade;
p=p->next;
}
printf("The all students C language grade is %d\n",cgrades);
printf("The all students Math grade is %d\n",mgrades);
printf("The all students English grade is %d\n",egrades);
}

struct student *sorts(struct student*head) {
struct student *f=NULL,*t=NULL, *max, *pr=NULL, *p;
while(head!=NULL) {
for(p=head,max=head;p->next!=NULL;p=p->next)
if(p->next->cgrade>max->cgrade) {
pr=p;max=p->next;
}
if(f==NULL) {
f=max;t=max;
}
else{
t->next = max;t = max;
}
if (max==head)
head = head->next;
else
pr->next = max->next;
}
t->next = NULL;
printf("You sort the students' information with C language grade\n");
return f;
}

void saves(struct student*head) {
FILE *w =fopen("output.txt","w");
struct student *p=head;
while(p) {
fprintf(w,"The student's number:%s\n",p->num);
fprintf(w,"The student's name:%s\n",p->name);
fprintf(w,"The student's C language grade:%d\n",p->cgrade);
fprintf(w,"The student's Math grade:%d\n",p->mgrade);
fprintf(w,"The student's English grade:%d\n",p->egrade);
fprintf(w,"The student's total grade:%d\n",p->total);
fprintf(w,"The student's average grade:%f\n",p->ave);
fprintf(w,"The student's rank :%d\n\n\n",p->mingci);
p=p->next;
}
fclose(w);
printf("Save the students's information successfully!\n");
}

void displays(struct student*head) {
struct student *p=head;
if(head==NULL) {
printf("student's information is empty!\n");
return (head);
}
while(p!=NULL) {
printf("The students number is:%s\n",p->num);
printf("The students name is:%s\n",p->name);
printf("The students C language grade is:%d\n",p->cgrade);
printf("The students Math grade is:%d\n",p->mgrade);
printf("The students English grade is:%d\n",p->egrade);
printf("The students sum grade is:%d\n",p->total);
printf("The students average grade is:%f\n",p->ave);
printf("The students rank  is:%d\n\n\n",p->mingci);
p=p->next;
}
}

void release(struct student*head) {
struct student *p=head,*pr=NULL;
while(p!=NULL) {
pr=p;
p=p->next;
free(pr);
}
}

int main()
{
print();
int x;
struct student *head=NULL;
while(scanf("%d",&x)&&x) {
if(x>9) printf("please input the number from 0 to 9");
else {
if(x==1) head=inputs(head);
if(x==2) head=deletes(head);
if(x==3) searchs(head);
if(x==4) head=modifys(head);
if(x==5) head=inserts(head);
if(x==6) counts(head);
if(x==7) head=sorts(head);
if(x==8) saves(head);
if(x==9) displays(head);
}
}
release(head);
printf("You had quit The students' Grade Management System\n");
return 0;
}