求C语言学生成绩管理！

做一下修改就行了

#include "stdio.h"
#include "stdlib.h"
#include "string.h"
int shoudsave=0;

struct student
{ char num[20]; //学号
char name[20];//姓名
char sex[4];//性别
float c; //语文
float m; //数学
float e;//英语
float total;//总分
float ave; //平均分
};

typedef struct node
{
struct student data;
struct node *next;
}Node,*Link;

void menu()
{
system("cls");
printf("\t\t学生成绩管理系统\n");
printf("\t*****************************************\n");
printf("\t* 1.添加信息\t\t2.修改信息\t*\n");
printf("\t* 3.查询信息\t\t4.显示信息\t*\n");
printf("\t* 5.统计信息\t\t6.排列成绩\t*\n");
printf("\t* 7.保存信息\t\t8.帮助 \t*\n");
printf("\t* 0.退出\t\t\t\t*\n");
printf("\t******************************************\n");
}

void printstart()
{
printf("-----------------------------------------------------------------------\n");
}

void Wrong()
{
printf("\nInput wrong:!\n");
system("pause");
}

void Nofind()
{
printf("\nCan not find the student:!\n");
}

void printf()
{
printf("%-12s%-22s%-8s%6s%6s%6s%7s%6s\n","学号","姓名","性别","英语","数学","语文","总分","平均分");
}

void printe(Node *p)
{
printf("%-12s%-22s%-8s%6d%6d%6d%7d%6d\n",p->data.num,p->data.name,p->data.sex,p->data.e,p->data.m,p->data.c,p->data.total,p->data.ave);
}

Node* Locate(Link l,char findmess[],char nameornum[])
{
Node *r;
if(strcmp(nameornum,"num")==0)
{
r=l->next;
while(r!=NULL)
{
if(strcmp(r->data.num,findmess)==0)
return r;
r=r->next;
}
}
else if(strcmp(nameornum,"name")==0)
{
r=l->next;
while(r!=NULL)
{
if(strcmp(r->data.name,findmess)==0)
return r;
r=r->next;
}
}
return 0;
}

void Add(Link l)
{
Node *p,*r,*s;char num[10];r=l;
s=l->next;
while(r->next!=NULL)
{
r=r->next;
}
while(1)
{
printf("Please input student's number(Input '0' ,return to last gread:)");
scanf("%s",num);
if(strcmp(num,"0")==0)
{
system("pause");
break;
}
while(s)
{
if(strcmp(s->data.num,num)==0)
{
printf("student's number%s exist,if you want to change please input '2'!\n",num);
printstart();
printc();
printe(s);
printstart();
printf("\n");
return;
}
s=s->next;
}
p=(Node *)malloc(sizeof(Node));
strcpy(p->data.num,num);
printf("Input name:");
scanf("%s",p->data.name);getchar();
printf("Input sex:");
scanf("%s",p->data.sex);getchar();
printf("Input C language:");
scanf("%d",&p->data.c);getchar();
printf("Input maths:");
scanf("%d",&p->data.m);getchar();
printf("Input English:");
scanf("%d",&p->data.e);getchar();
p->data.total=p->data.e+p->data.c+p->data.m;
p->data.ave=p->data.total / 3;
p->next=NULL;
r->next=p;
r=p;
shoudsave=1;
}
}

void Qur(Link l)
{
int sel;
char findmess[20];
Node *p;
if(!l->next)
{
printf("\nNo message!\n");
return;
}
printf("\n=====>1Number\n=====>2Name\n");
scanf("%d",&sel);
if(sel==1)
{
printf("Input student's number:");
scanf("%s",findmess);
p=Locate(l,findmess,"num");
if(p)
{
printf("\t\t\t\tResult\n");
printstart();printc();printe(p); printstart();
}
else
Nofind();
}
else if(sel==2)
{
printf("Input student's name:");
scanf("%s",findmess);
p=Locate(l,findmess,"name");
if(p)
{
printf("\t\t\t\tResult\n");
printstart();
printc();
printe(p);
printstart();
}
else
Nofind();
}
else
Wrong();
system("pause");
}

void Modify(Link l)
{
Node *p;
char findmess[20];
if(!l->next)
{
printf("\nNo message!\n");
return;
}
printf("Input student's number:");
scanf("%s",findmess);
p=Locate(l,findmess,"num");
if(p)
{
printf("Input the new student's number(the old one is%s):",p->data.num);
scanf("%s",p->data.num);
printf("Input the new student's name(the old one is%s):",p->data.name);
scanf("%s",p->data.name);getchar();
printf("Input the new student's sex(the old one is%s):",p->data.sex);
scanf("%s",p->data.sex);
printf("Input the new student's C(the old one is%d):",p->data.c);
scanf("%d",&p->data.c);getchar();
printf("Input the new student's maths(the old one is%d)::",p->data.m);
scanf("%d",&p->data.m);getchar();
printf("Input the new student's English(the old one is%d):",p->data.e);
scanf("%d",&p->data.e);
p->data.total=p->data.e+p->data.c+p->data.m;
p->data.ave=p->data.total/3;
printf("\nOK!\n");
shoudsave=1;
}
else
Nofind();
system("pause");
}

void Disp(Link l)
{
int count=0;
Node *p;
p=l->next;
if(!p)
{
printf("\nNo message:!\n");
return;
}
printf("\t\t\t\tResult\n");
printstart();printc();printf("\n");
while(p)
{
printe(p);
p=p->next;
}
printstart();
printf("\n");
system("pause");
}

void Tongji(Link l)
{
Node *pm,*pe,*pc,*pt,*pa;
Node *r=l->next;
if(!r)
{
printf("\nNo message can be tongji!\n");
return ;
}
pm=pe=pc=pt=pa=r;
while(r!=NULL)
{
if(r->data.c>=pc->data.c) pc=r;
if(r->data.m>=pm->data.m) pm=r;
if(r->data.e>=pe->data.e) pe=r;
if(r->data.total>=pt->data.total) pt=r;
if(r->data.ave>=pa->data.ave) pa=r;
r=r->next;
}
printf("------------------------------Result--------------------------------\n");
printf("Total:\t%s %d\n",pt->data.name,pt->data.total);
printf("Average:\t%s %d\n",pa->data.name,pa->data.ave);
printf("English:\t%s %d\n",pe->data.name,pe->data.e);
printf("maths:\t%s %d\n",pm->data.name,pm->data.m);
printf("C languane:\t%s %d\n",pc->data.name,pc->data.c);
printstart();
system("pause");
}

void Sort(Link l)
{
Link ll;
Node *p,*rr,*s;
ll=(Link)malloc(sizeof(Node));
ll->next=NULL;
if(l->next==NULL)
{
printf("\nNo message!\n");
system("pause");
return ;
}
p=l->next;
while(p)
{
s=(Node*)malloc(sizeof(Node));
s->data=p->data;
s->next=NULL;
rr=ll;
while(rr->next!=NULL && rr->next->data.total>=p->data.total)
rr=rr->next;
if(rr->next==NULL)
rr->next=s;
else
{
s->next=rr->next;
rr->next=s;
}
p=p->next;
}
free(l);
l->next=ll->next;
printf("\nData had been sorted!\n");
shoudsave=1;
system("pause");
}

void Save(Link l)
{
FILE* fp;
Node *p;
int flag=1,count=0;
fp=fopen("student","wb");
if(fp==NULL)
{
printf("\nWrong happened,when opened this time!\n");
exit(1);
}
p=l->next;
while(p)
{
if(fwrite(p,sizeof(Node),1,fp)==1)
{
p=p->next;count++;
}
else
{
flag=0;
break;
}
}
if(flag)
{
printf("\n%d data have been saved!\n\n",count);
shoudsave=0;
}
fclose(fp);
system("pause");
}

int main()
{
Link l;
FILE *fp;
int sel;
char ch;
char jian;
int count=0;
Node *p,*r;
printf("\t************学生成绩管理系统**************\n");
l=(Node*)malloc(sizeof(Node));
l->next=NULL;
r=l;
fp=fopen("student","rb");
if(fp==NULL)
{
printf("\n文件不存在.是否建立一个新文件:(y/n)\n");
scanf("%c",&jian);
if(jian=='y'||jian=='Y')
{
fp=fopen("student","wb");
if(fp!=NULL)fclose(fp);
printf("Data file had been created!\t Please restart this Program.\n");
system("pause");
exit(1);
}
else exit(0);
}
printf("\nFile open.Loading....\n");
while(!feof(fp))
{
p=(Node*)malloc(sizeof(Node));
if(fread(p,sizeof(Node),1,fp))
{
p->next=NULL;
r->next=p;
r=p;
count++;
}
}
fclose(fp);
printf("\nFile is saved,%d in total!\n",count);
while(1)
{
menu();
printf("What do you want(please selet 0~8):");
scanf("%d",&sel);
if(sel==0)
{
if(shoudsave==1)
{
getchar();
printf("File changed,do you want save?\n");
scanf("%c",&ch);
if(ch=='y'||ch=='Y')
Save(l);
}
printf("\nThank you.wellcome useing this syetem next time\n");
system("pause");
break;
}
switch(sel)
{
case 1:Add(l);break;
case 2:Modify(l);break;
case 3:Qur(l);break;
case 4:Disp(l);break;
case 5:Tongji(l);break;
case 6:Sort(l);break;
case 7:Save(l);break;
case 8:printf("\tDon't you know English!\n");system("pause");break;
default: Wrong();getchar();break;
}
}
return 0;
}

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