程序例題:C語言做的一個學(xué)生選課系統(tǒng)

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這是這幾天我用C做的一個簡易的學(xué)生選課系統(tǒng).其實是我們的1道程序?qū)嵺`考試題,我想請大家看看,幫我提些建議.
    #include
    #include
    int N1,N2,kk1,kk2,kk3;
    struct couse * head1;
    struct student * head2;
    struct couse//課程信息結(jié)構(gòu)體
    {
    int num1;
    char name1[20];
    int score;
    int nelepeo;//課程已選人數(shù)
    int Melepeo;//課程人數(shù)上限
    struct couse * next;
    };
    struct student//學(xué)生信息結(jié)構(gòu)體
    {
    int num2;
    char name2[20];
    int nelenum[50];//已選課程編號
    int nelen;//已選課程數(shù)量
    struct student * next;
    };
    void Ms()
    {
    for(kk1=0;kk1<1100;kk1++)
    for(kk2=0;kk2<1200;kk2++)
    for(kk3=0;kk3<1200;kk3++);
    }
    void keyboardc()//錄入課程子函數(shù)(從鍵盤錄入)
    {
    struct couse *p1,*p2;
    N1=0;
    p1=p2=(struct couse*)malloc(sizeof(struct couse));
    printf("課程編號\t課程名稱\t學(xué)分\t課程人數(shù)上限\n");
    scanf("%d%s%d%d",&p1->num1,p1->name1,&p1->score,&p1->Melepeo);
    p1->nelepeo=0;
    head1=NULL;
    while(p1->num1!=0)
    {
    N1=N1+1;
    if(N1==1)head1=p1;
    else p2->next=p1;
    p2=p1;
    p1=(struct couse * )malloc(sizeof(struct couse));
    scanf("%d%s%d%d",&p1->num1,p1->name1,&p1->score,&p1->Melepeo);
    p1->nelepeo=0;
    }
    p2->next=NULL;
    }
    void filec()//錄入鍵盤子函數(shù)(從文件錄入)
    {
    FILE * fp;
    char filepath[20];
    struct couse *p1,*p2;
    N1=0;
    printf("輸入要讀入的文件路徑:");
    getchar();
    gets(filepath);
    if((fp=fopen(filepath,"r"))==NULL)
    {
    printf("找不到%s文件!\n",filepath);
    exit(0);
    }
    p1=p2=(struct couse*)malloc(sizeof(struct couse));
    fscanf(fp,"%d%s%d%d%d",&p1->num1,p1->name1,&p1->score,&p1->nelepeo,&p1->Melepeo);
    head1=NULL;
    while(!feof(fp))
    {
    N1=N1+1;
    if(N1==1)head1=p1;
    else p2->next=p1;
    p2=p1;
    p1=(struct couse * )malloc(sizeof(struct couse));
    fscanf(fp,"%d%s%d%d%d",&p1->num1,p1->name1,&p1->score,&p1->nelepeo,&p1->Melepeo);
    }
    p2->next=NULL;
    }
    void inputc()//錄入課程主函數(shù)
    {
    int i;
    printf("\t\t\t錄入課程信息\n");
    printf("\n1.從鍵盤錄入\n");
    printf("2.從文件錄入\n");
    printf("3.返回主菜單\n");
    printf("請選擇(1~3):\n");
    scanf("%d",&i);
    switch(i)
    {
    case(1):keyboardc();break;
    case(2):filec();break;
    case(3):break;
    }
    }
    void insertc(struct couse *incouse)//課程管理子函數(shù)(增加課程)
    {
    struct couse *p0,*p1,*p2;
    p1=head1;
    p0=incouse;
    if(head1==NULL)
    {
    head1=p0;
    p0->next=NULL;
    }
    else
    {
    while((p0->num1 > p1->num1) && (p1->next!=NULL))
    {
    p2=p1;
    p1=p1->next;
    }
    if(p0->num1 <= p1->num1)
    {
    if(head1==p1) head1=p0;
    else p2->next=p0;
    p0->next=p1;
    }
    else
    {
    p1->next=p0;
    p0->next=NULL;
    }
    }
    N1=N1+1;
    }
    void delc(int num1)//課程管理子函數(shù)(刪除課程)
    {
    struct couse *p1,*p2;
    if(head1==NULL)
    {
    printf("\n沒有課程,無法刪除!\n");
    goto end;
    }
    p1=head1;
    while(num1!=p1->num1 && p1->next!=NULL)
    {
    p2=p1;
    p1=p1->next;
    }
    if(num1==p1->num1)
    {
    if(p1==head1) head1=p1->next;
    else p2->next=p1->next;
    printf("已刪除該編號課程!\n");
    N1=N1-1;
    }
    else printf("無該編號的課程!\n");
    end:;
    } 　void managementc()//課程管理主函數(shù)
    {
    struct couse * incouse;
    int i,num1;
    printf("\t\t\t課程管理\n");
    printf("1.新增課程\n");
    printf("2.刪除課程\n");
    printf("3.返回主菜單\n");
    printf("請選擇(1~3):\n");
    scanf("%d",&i);
    switch(i)
    {
    case(1):
    {
    incouse=(struct couse *)malloc(sizeof(struct couse));
    printf("課程編號\t課程名稱\t學(xué)分\t課程人數(shù)上限\n");
    scanf("%d%s%d%d",&incouse->num1,incouse->name1,&incouse->score,&incouse->Melepeo);
    incouse->nelepeo=0;
    insertc(incouse);
    break;
    }
    case(2):
    {
    printf("請輸入要刪除課程的編號:\n");
    scanf("%d",&num1);
    delc(num1);
    break;
    }
    case(3):break;
    }
    }
    void keyboards()//錄入學(xué)生信息子函數(shù)（從鍵盤錄入）
    {
    int i;
    struct student *p1,*p2;
    N2=0;
    p1=p2=(struct student *)malloc(sizeof(struct student));
    printf("學(xué)生學(xué)號\t學(xué)生姓名\n");
    scanf("%d%s",&p1->num2,p1->name2);
    p1->nelen=0;
    for(i=0;i<20;i++) p1->nelenum[i]=0;
    head2=NULL;
    while(p1->num2!=0)
    {
    N2=N2+1;
    if(N2==1)head2=p1;
    else p2->next=p1;
    p2=p1;
    p1=(struct student * )malloc(sizeof(struct student));
    scanf("%d%s",&p1->num2,p1->name2);
    p1->nelen=0;
    for(i=0;i<20;i++) p1->nelenum[i]=0;
    }
    p2->next=NULL;
    }
    void files()//錄入學(xué)生信息子函數(shù)（從文件錄入）
    {
    int i=0;
    FILE * fp;
    char filepath[20];
    struct student *p1,*p2;
    N2=0;
    printf("輸入要讀入的文件路徑:");
    getchar();
    gets(filepath);
    if((fp=fopen(filepath,"r"))==NULL)
    {
    printf("找不到%s文件!\n",filepath);
    exit(0);
    }
    p1=p2=(struct student*)malloc(sizeof(struct student));
    fread(p1,sizeof(struct student),1,fp);
    head2=NULL;
    while(!feof(fp))
    {
    i=0;
    N2=N2+1;
    if(N2==1)head2=p1;
    else p2->next=p1;
    p2=p1;
    p1=(struct student * )malloc(sizeof(struct student));
    fread(p1,sizeof(struct student),1,fp);
    }
    p2->next=NULL;
    }
    void inputs()//錄入學(xué)生信息主函數(shù)
    {
    int i;
    printf("\t\t\t錄入學(xué)生信息\n");
    printf("\n1.從鍵盤錄入\n");
    printf("2.從文件錄入\n");
    printf("3.返回主菜單\n");
    printf("請選擇(1~3):\n");
    scanf("%d",&i);
    switch(i)
    {
    case(1):keyboards();break;
    case(2):files();break;
    case(3):break;
    }
    }
    void inserts(struct student * incouse)//學(xué)生信息管理子函數(shù)(填加學(xué)生信息)
    {
    struct student *p0,*p1,*p2;
    p1=head2;
    p0=incouse;
    if(head2==NULL)
    {
    head2=p0;
    p0->next=NULL;
    }
    else
    {
    while((p0->num2 > p1->num2) && (p1->next!=NULL))
    {
    p2=p1;
    p1=p1->next;
    }
    if(p0->num2 <= p1->num2)
    {
    if(head2==p1) head2=p0;
    else p2->next=p0;
    p0->next=p1;
    }
    else
    {
    p1->next=p0;
    p0->next=NULL;
    }
    }
    N2=N2+1;
    }
    void dels(int num2)//學(xué)生信息管理子函數(shù)（刪除學(xué)生信息)
    {
    struct student *p1,*p2;
    if(head2==NULL)
    {
    printf("\n沒有該學(xué)生信息,無法刪除!\n");
    goto end;
    }
    p1=head2;
    while(num2!=p1->num2 && p1->next!=NULL)
    {
    p2=p1;
    p1=p1->next;
    }
    if(num2==p1->num2)
    {
    if(p1==head2) head2=p1->next;
    else p2->next=p1->next;
    printf("已刪除該學(xué)生信息!\n");
    N2=N2-1;
    }
    else printf("無該學(xué)號的學(xué)生!\n");
    end:;
    }