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C語言課程設計報告 一、實踐的目的和要求 加深對《C語言程序設計》課程所學知識的理解，進一步鞏固C語言講法規(guī)則。學會編制結構清晰、風格良好、數據結構適當的C語言程序，從而具備解決綜合性實際問題的能力 二、實踐內容 在熟練掌握C語言的基本知識：數據類型（整形、實型、字符型、指針、數組、結構等）；運算類型（算術運算、邏輯運算、自增自減運算、賦值運算等）；程序結構（順序結構、判斷選擇結構、循環(huán)結構）；函數的使用，結構體和文件的操作等。 三、設計說明 學生成績管理系統 建立一個學生成績管理系統。 程序運行時顯示一個簡單的菜單。 例如： 1.信息輸入（INPUT） 2.信息的刪除與修改 3.顯示當前學生成績的記錄信息，若無記錄，則給出提示信息 4.學生或者各個班級各門課程總分、平均分、最低分、最高分等的統計 5.可以按照班級、姓名、性別、分數(可以有區(qū)間)等方式進行查詢 6.具有良好的交互功能 7.能使用圖形函數進行簡單的界面設計 8.具有良好的糾錯功能 9.退出等等
程序：
#include <stdio.h> /*文件操作（讀文件）*/
#include<dos.h> #include<stdlib.h> /*其它說明*/ #include<string.h> /*字符串函數*/ #include<mem.h> /*內存操作函數*/ #include<conio.h> /*屏幕操作函數*/ #include<ctype.h> /*字符操作函數*/ #include<alloc.h> /*動態(tài)地址分配函數*/ #include<time.h> #define LEN sizeof(STUDENT) #define N 3 typedef struct stu /*定義結構體數組用于緩存數據*/ {char grade[6]; char name[5]; char sex[4] ; int score[N]; int sum; float average; int order; struct stu *next; }STUDENT; /*以下是函數原型*/
STUDENT *init(); /*初始化函數*/ STUDENT *create(); /*創(chuàng)建鏈表*/ STUDENT *delete(STUDENT *head); /*刪除記錄*/ STUDENT *sort(STUDENT *head); /*按平均分排序*/ void print(STUDENT *head); /* 顯示所有記錄*/ void name(STUDENT *head); /*姓名查找*/ void grade(STUDENT *head); /*班級查找*/ void sex(STUDENT *head); /*性別查找*/ void average(STUDENT *head); /*按平均分查找在那個分數里*/ STUDENT *statistciam(STUDENT *head);/*統計記錄*/ void save(STUDENT *head); /*保存文件*/ STUDENT *load(); /*讀文件*/ STUDENT *insert(STUDENT *head,STUDENT *new); /*插入記錄*/ int menu_select(); /*菜單函數*/ int menu_search(); /*查詢菜單*/ void code(); /*密碼驗證*/ /*主函數界面*/
main() { int i,j,n,m; STUDENT *head,new; /*鏈表定義頭指針*/ randomize();/*開啟揚聲器，發(fā)出聲音*/ while(!bioskey(1)) { j=rand()*5000; sound(j); delay(10); } nosound();/*關閉聲音文件*/ code();/*密碼輸入*/ clrscr(); /*清屏*/
for(;;) /*無限循環(huán)*/ { switch(menu_select()) /*調用主菜單函數，返回值整數作開關語句的條件*/ { /*值不同，執(zhí)行的函數不同，break 不能省略*/ case 0:head=init();break; /*執(zhí)行初始化*/ case 1:head=create();break; /*創(chuàng)建鏈表*/ case 2:head=delete(head);break; /*刪除記錄*/ case 3:print(head);break; /*顯示全部記錄*/ case 4: loop: printf("sreach:\n 1.grade\n 2.name\n 3.sex\n 4.average\n 5.quit\n Enter you choice(0~5):"); scanf("%d",&n); switch(n) { case 1:grade(head); goto loop; case 2:name(head); goto loop; case 3:sex(head); goto loop; case 4:average(head); goto loop; case 5: break; } break; /*查找記錄*/ case 5:sort(head);break; /*排序*/ case 6:save(head);break; /*保存文件*/ case 7:head=load(); break; /*讀文件*/ case 8:head=insert(head,&new); break; /*插入記錄*/ case 9:head=statistciam(head); break; /*統計記錄*/ case 10:exit(0); /*如菜單返回值為10程序結束*/ } } } /*密碼輸入*/ void code() { int i; char number[20]; const w=10; printf("\n\t\t\t--------------------------------------------------"); printf("\n\t\t\tBecause this system is busywork,Code is: 123456"); printf("\n\t\t\t----------------------------------------------- "); printf("\n"); printf("\n"); printf("\n"); printf("\n"); printf("\n"); printf("\n"); printf("\n\t*********************************"); printf("\n\t Please Enter The Code : "); printf("\n\t*********************************\n"); scanf("%s",number); printf("\n\t\t\tExamining!"); for(i=0;i<=w;i++) { printf("*"); }
if(strcmp(number,"123456")==0) { printf("\n\t\t\tCode is right！press any key enter menu......"); clrscr();
} else { printf("\n\t\t\tCode is wrong!Please enter again : "); clrscr();
code(); } } /*初始化函數*/ STUDENT *init() { return NULL; /*返回空指針*/ } /*菜單選擇函數*/
menu_select() { char *menu[]={"********************************************",
" Welcome to ", " The student score manage system!", "*****************MENU***********************", /*定義菜單字符串數組*/ " 0. Init list", /*初始化*/ " 1. Input list", /*輸入記錄*/ " 2. Delete a record from list", /*從表中刪除記錄*/ " 3. Print list ", /*顯示當前學生成績的記錄信息*/ " 4. Search record ", /*查詢學生記錄*/ " 5. Sort to make new a file ", /*排序*/ " 6. Save the file", /*將單鏈表中記錄保存到文件中*/ " 7. Load the file", /*從文件中讀入記錄*/ " 8. insert record to list ", /*插入記錄到表中*/ " 9. statistciam record to list ", /*統計記錄到表中*/ " 10. Quit", /*退出*/ "********************************************", " Producer:ZengWenyan ZhaoJingxiu ", " Faculty Adviser:XiaoFengrui ",}; /*退出*/ char s[3]; /*以字符形式保存選擇號*/ int c,i; /*定義整形變量*/ textbackground(MAGENTA); /*設置背景顏色為粉色*/ gotoxy(1,50); /*移動光標*/ printf("press any key enter menu......\n"); /*壓任一鍵進入主菜單*/ getch(); /*輸入任一鍵*/ clrscr(); /*清屏幕*/ gotoxy(1,1); /*移動光標*/ textcolor(YELLOW); /*設置文本顯示顏色為黃色*/ textbackground(BLUE); /*設置背景顏色為藍色*/ gotoxy(15,2); /*移動光標*/ putch(0xc9); /*輸出左上角邊框┏*/ for(i=1;i<44;i++) putch(0xcd); /*輸出上邊框水平線*/ putch(0xbb); /*輸出右上角邊框 ┓*/ for(i=3;i<23;i++) { gotoxy(15,i);putch(0xba); /*輸出左垂直線*/ gotoxy(59,i);putch(0xba); } /*輸出右垂直線*/ gotoxy(15,22);putch(0xc8); /*輸出左上角邊框┗*/ for(i=1;i<44;i++) putch(0xcd); /*輸出下邊框水平線*/ putch(0xbc); /*輸出右下角邊框┛*/ window(16,3,58,21); /* 制作顯示菜單的窗口，大小根據菜單條數設計*/ clrscr(); /*清屏*/ for(i=0;i<18;i++) /*輸出主菜單數組*/ { gotoxy(1,i+1); cprintf("%s",menu[i]); } textbackground(BLACK); /*設置背景顏色為黑色*/ window(1,1,80,25); /*恢復原窗口大小*/ gotoxy(10,23); /*移動光標*/ do{ printf("\n Enter you choice(0~10):"); /*在菜單窗口外顯示提示信息*/ scanf("%s",s); /*輸入選擇項*/ c=atoi(s); /*將輸入的字符串轉化為整形數*/ }while(c<0||c>10); /*選擇項不在0~10之間重輸*/ return c; /*返回選擇項，主程序根據該數調用相應的函數*/ } /*輸入函數*/
STUDENT *create() {int i,s; STUDENT *head=NULL,*p; /* 定義函數.此函數帶回一個指向鏈表頭的指針*/ clrscr(); textbackground(MAGENTA); textcolor(BLUE); for(;;) {p=(STUDENT *)malloc(LEN); /*開辟一個新的單元*/ if(!p) /*如果指針p為空*/ {printf("\nOut of memory."); /*輸出內存溢出*/ return (head); /*返回頭指針,下同*/ } printf("Enter the grade(0:list end):"); scanf("%s",p->grade); if(p->grade[0]=='0') break; /*如果班級首字符為0則結束輸入*/ printf("Enter the name:"); scanf("%s",p->name); do{ printf("Enter the sex(M or W):"); scanf("%s",&p->sex[0]); if(p->sex[0]!='M'&&p->sex[0]!='W') printf("Data error,please enter again.\n"); }while(p->sex[0]!='M'&&p->sex[0]!='W'); printf("Please enter the %d scores\n",3); /*提示開始輸入成績*/ s=0; /*計算每個學生的總分，初值為0*/ for(i=0;i<N;i++) /*3門課程循環(huán)3次*/ { do{ printf("score%d:",i+1); scanf("%d",&p->score[i]); if(p->score[i]<0 || p->score[i]>100) /*確保成績在0~100之間*/ printf("Data error,please enter again.\n"); }while(p->score[i]<0 || p->score[i]>100); s=s+p->score[i]; /*累加各門成績*/ } p->sum=s; /*將總分保存*/ p->average=(float)s/3; /*先用強制類型轉換將s轉換成float型,再求平均值*/ p->order=0; /*未排序前此值為0*/ p->next=head; /*將頭結點做為新輸入結點的后繼結點*/ head=p; /*新輸入結點為新的頭結點*/ } return(head); } /*刪除記錄函數*/ STUDENT *delete(STUDENT *head) {int n; STUDENT *p1,*p2; /*p1為查找到要刪除的結點指針，p2為其前驅指針*/ char c,s[6]; /*s[6]用來存放班級,c用來輸入字母*/ clrscr(); textbackground(MAGENTA); textcolor(BLUE); printf("Please enter the deleted grade: "); scanf("%s",s); p1=p2=head; /*給p1和p2賦初值頭指針*/ while(strcmp(p1->grade,s) && p1 != NULL) /*當記錄的班級不是要找的，或指針不為空時*/ {p2=p1; /*將p1指針值賦給p2作為p1的前驅指針*/ p1=p1->next; /*將p1指針指向下一條記錄*/ } if(strcmp(p1->grade,s)==0) /*班級找到了*/ {printf("**************************************FOUND************************************\n"); printf("-------------------------------------------------------------------------------\n"); printf("| Grade | Name | sc1 | sc2 | sc3 | Sum | Ave | Order |\n"); printf("-------------------------------------------------------------------------------\n"); printf("| %4s | %4s | %3d | %3d | %3d | %3d | %4.2f | %-5d |\n", p1->grade,p1->name,p1->score[0],p1->score[1],p1->score[2],p1->sum,p1->average,p1->order); printf("-------------------------------------------------------------------------------\n"); printf("***************************************END**************************************\n"); printf("Are you sure to delete the student Y/N ?"); /*提示是否要刪除,輸入Y刪除,N則退出*/ for(;;) {scanf("%c",&c); if(c=='n'||c=='N') break; /*如果不刪除,則跳出本循環(huán)*/ if(c=='y'||c=='Y') { if(p1==head) /*若p1==head，說明被刪結點是首結點*/ head=p1->next; /*把第二個結點地址賦予head*/ else p2->next=p1->next; /*否則將一下結點地址賦給前一結點地址*/ n=n-1; printf("\nNum %s student have been deleted.\n",s); printf("Don't forget to save.\n");break; /*刪除后就跳出循環(huán)*/ } } } else printf("\nThere is no num %s student on the list.\n",s); /*找不到該結點*/ return(head); } /* 顯示全部記錄函數*/ void print(STUDENT *head) {int i=0; /* 統計記錄條數*/ STUDENT *p; /*移動指針*/ clrscr(); textbackground(MAGENTA); textcolor(BLUE); p=head; /*初值為頭指針*/ printf("\n************************************STUDENT************************************\n"); printf("-------------------------------------------------------------------------------\n"); printf("| Rec | Grade | Name | Sc1 | Sc2 | Sc3 | Sum | Ave | Order |\n"); printf("-------------------------------------------------------------------------------\n"); while(p!=NULL) { i++; printf("| %3d | %4s | %-4s | %3d | %3d | %3d | %3d | %4.2f| %-5d |\n", i, p->grade,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order); p=p->next; } printf("-------------------------------------------------------------------------------\n"); printf("**************************************END**************************************\n"); } /*姓名查找記錄函數*/ void name(STUDENT *head) {STUDENT *p; /* 移動指針*/ char s[5]; /*存放姓名用的字符數組*/ clrscr(); textbackground(MAGENTA); textcolor(BLUE); printf("Please enter name for searching.\n"); scanf("%s",s); p=head; /*將頭指針賦給p*/ while(strcmp(p->name,s) && p != NULL) /*當記錄的姓名不是要找的，或指針不為空時*/ p=p->next; /*移動指針，指向下一結點*/ if(p!=NULL) /*如果指針不為空*/ {printf("\n*************************************FOUND************************************\n"); printf("-------------------------------------------------------------------------------\n"); printf("| Grade | Name | sc1 | sc2 | sc3 | Sum | Ave | Order |\n"); printf("-------------------------------------------------------------------------------\n"); printf("| %4s | %4s | %3d | %3d | %3d | %3d | %4.2f | %-5d|\n", p->grade,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order); printf("-------------------------------------------------------------------------------\n"); printf("***************************************END**************************************\n"); } else printf("\nThere is no name %s student on the list.\n",s); /*顯示沒有該學生*/ } /*班級查找記錄函數*/ void grade(STUDENT *head) {STUDENT *p; /* 移動指針*/ char s[6]; /*存放班級用的字符數組*/ clrscr(); textbackground(MAGENTA); textcolor(BLUE); printf("Please enter grade for searching.\n"); scanf("%s",s); p=head; /*將頭指針賦給p*/ while(strcmp(p->grade,s) && p != NULL) /*當記錄班級不是要找的，或指針不為空時*/ p=p->next; /*移動指針，指向下一結點*/ if(p!=NULL) /*如果指針不為空*/ {printf("\n*************************************FOUND************************************\n"); printf("-------------------------------------------------------------------------------\n"); printf("| Grade | Name | sc1 | sc2 | sc3 | Sum | Ave | Order |\n"); printf("-------------------------------------------------------------------------------\n"); printf("| %4s | %4s | %3d | %3d | %3d | %3d | %4.2f | %-5d |\n", p->grade,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order); printf("-------------------------------------------------------------------------------\n"); printf("***************************************END**************************************\n"); } else printf("\nThere is no grade %s student on the list.\n",s); /*顯示沒有該學生*/ } /*性別查找記錄函數*/ void sex(STUDENT *head) {STUDENT *p; /* 移動指針*/ char s[4]; /*存放性別用的字符數組*/ clrscr(); textbackground(MAGENTA); textcolor(BLUE); printf("Please enter sex for searching.\n"); scanf("%s",s); p=head; /*將頭指針賦給p*/ while(strcmp(p->sex,s) && p != NULL) /*當記錄的性別不是要找的，或指針不為空時*/ p=p->next; /*移動指針，指向下一結點*/ if(p!=NULL) /*如果指針不為空*/ {printf("\n*************************************FOUND************************************\n"); printf("-------------------------------------------------------------------------------\n"); printf("| Grade | Name | sc1 | sc2 | sc3 | Sum | Ave | Order |\n"); printf("-------------------------------------------------------------------------------\n"); printf("| %4s | %4s | %3d | %3d | %3d | %3d | %4.2f | %-5d |\n", p->grade,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order); printf("-------------------------------------------------------------------------------\n"); printf("***************************************END**************************************\n"); } else printf("\nThere is no sex %s student on the list.\n",s); /*顯示沒有該學生*/ } /* 用平均分進行分數段查找 */
void average(STUDENT *head) { STUDENT *p; /* 移動指針*/ clrscr(); textbackground(MAGENTA); textcolor(BLUE); p=head; /*將頭指針賦給p*/
if(p!=NULL&&p->average<60&&p->average>0) /*如果指針不為空且平均分在0-60之間*/ { printf("\n**********************************not pass************************************\n"); printf("-------------------------------------------------------------------------------\n"); printf("| Grade | Name | sc1 | sc2 | sc3 | Sum | Ave | Order |\n"); printf("-------------------------------------------------------------------------------\n"); printf("| %4s | %4s | %3d | %3d | %3d | %3d | %4.2f | %-5d |\n", p->grade,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order); printf("-------------------------------------------------------------------------------\n"); printf("***************************************END**************************************\n"); } else if(p!=NULL&&p->average<70&&p->average>=60) /*如果指針不為空且平均分在60-70之間*/ { printf("\n**********************************60-70************************************\n"); printf("-------------------------------------------------------------------------------\n"); printf("| Grade | Name | sc1 | sc2 | sc3 | Sum | Ave | Order |\n"); printf("-------------------------------------------------------------------------------\n"); printf("| %4s | %4s | %3d | %3d | %3d | %3d | %4.2f | %-5d |\n", p->grade,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order); printf("-------------------------------------------------------------------------------\n"); printf("***************************************END**************************************\n"); } else if(p!=NULL&&p->average<80&&p->average>=70) /*如果指針不為空且平均分在70-80之間*/ { printf("\n**********************************70-80************************************\n"); printf("-------------------------------------------------------------------------------\n"); printf("| Grade | Name | sc1 | sc2 | sc3 | Sum | Ave | Order |\n"); printf("-------------------------------------------------------------------------------\n"); printf("| %4s | %4s | %3d | %3d | %3d | %3d | %4.2f | %-5d |\n", p->grade,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order); printf("-------------------------------------------------------------------------------\n"); printf("***************************************END**************************************\n"); } else if(p!=NULL&&p->average<90&&p->average>=80) /*如果指針不為空且平均分在80-90之間*/ { printf("\n**********************************80-90************************************\n"); printf("-------------------------------------------------------------------------------\n"); printf("| Grade | Name | sc1 | sc2 | sc3 | Sum | Ave | Order |\n"); printf("-------------------------------------------------------------------------------\n"); printf("| %4s | %4s | %3d | %3d | %3d | %3d | %4.2f | %-5d |\n", p->grade,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order); printf("-------------------------------------------------------------------------------\n"); printf("***************************************END**************************************\n"); } else if(p!=NULL&&p->average<100&&p->average>=90) /*如果指針不為空且平均分在90-100之間*/ { printf("\n**********************************90-100************************************\n"); printf("-------------------------------------------------------------------------------\n"); printf("| Grade | Name | sc1 | sc2 | sc3 | Sum | Ave | Order |\n"); printf("-------------------------------------------------------------------------------\n"); printf("| %4s | %4s | %3d | %3d | %3d | %3d | %4.2f | %-5d |\n", p->grade,p->name,p->score[0],p->score[1],p->score[2],p->sum,p->average,p->order); printf("-------------------------------------------------------------------------------\n"); printf("***************************************END**************************************\n"); } else printf("\nThere is not average student on the list.\n"); /*顯示沒有該學生*/ }
/*保存數據到文件函數*/
void save(STUDENT *head) {FILE *fp; /*定義指向文件的指針*/ STUDENT *p; /* 定義移動指針*/ char outfile[10]; printf("Enter outfile name,for example c:\\score\n"); scanf("%s",outfile); if((fp=fopen(outfile,"wb"))==NULL) /*為輸出打開一個二進制文件,為只寫方式*/ { printf("Cannot open the file\n"); return; /*若打不開則返回菜單*/ } printf("\nSaving the file......\n"); p=head; /*移動指針從頭指針開始*/ while(p!=NULL) /*如p不為空*/ { fwrite(p,LEN,1,fp); /*寫入一條記錄*/ p=p->next; /*指針后移*/ } fclose(fp); /*關閉文件*/ printf("Save the file successfully!\n"); } /* 從文件讀數據函數*/
STUDENT *load() {STUDENT *p1,*p2,*head=NULL; /*定義記錄指針變量*/ FILE *fp; /* 定義指向文件的指針*/ char infile[10]; printf("Enter infile name,for example c:\\score\n"); scanf("%s",infile); if((fp=fopen(infile,"rb"))==NULL) /*打開一個二進制文件，為只讀方式*/ { printf("Can not open the file.\n"); return(head); } printf("\nLoading the file!\n"); p1=(STUDENT *)malloc(LEN); /*開辟一個新單元*/ if(!p1) { printf("Out of memory!\n"); return(head); } head=p1; /*申請到空間，將其作為頭指針*/ while(!feof(fp)) /*循環(huán)讀數據直到文件尾結束*/ { if(fread(p1,LEN,1,fp)!=1) break; /*如果沒讀到數據，跳出循環(huán)*/ p1->next=(STUDENT *)malloc(LEN); /*為下一個結點開辟空間*/ if(!p1->next) { printf("Out of memory!\n"); return (head); } p2=p1; /*使p2指向剛才p1指向的結點*/ p1=p1->next; /*指針后移，新讀入數據鏈到當前表尾*/ } p2->next=NULL; /*最后一個結點的后繼指針為空*/ fclose(fp); printf("You have success to read data from the file!\n"); return (head); } /*按平均分排序函數*/ STUDENT *sort(STUDENT *head) {int i=0; /*保存名次*/ STUDENT *p1,*p2,*t,*temp; /*定義臨時指針*/ temp=head->next; /*將原表的頭指針所指的下一個結點作頭指針*/ head->next=NULL; /*第一個結點為新表的頭結點*/ while(temp!=NULL) /*當原表不為空時，進行排序*/ { t=temp; /*取原表的頭結點*/ temp=temp->next; /*原表頭結點指針后移*/ p1=head; /*設定移動指針p1，從頭指針開始*/ p2=head; /*設定移動指針p2做為p1的前驅，初值為頭指針*/ while(t->average<p1->average&&p1!=NULL) /*作成績平均分比較*/ { p2=p1; /*待排序點值小，則新表指針后移*/ p1=p1->next; } if(p1==p2) /*p1==p2，說明待排序點值大，應排在首位*/ { t->next=p1; /*待排序點的后繼為p*/ head=t; /*新頭結點為待排序點*/ } else /*待排序點應插入在中間某個位置p2和p1之間，如p為空則是尾部*/ { t->next=p1; /*t的后繼是p1*/ p2->next=t; /*p2的后繼是t*/ } } p1=head; /*已排好序的頭指針賦給p1，準備填寫名次*/ while(p1!=NULL) /*當p1不為空時，進行下列操作*/ { i++; /*結點序號*/ p1->order=i; /*將結點序號賦值給名次*/ p1=p1->next; /*指針后移*/ } printf("Sorting is sucessful.\n"); /*排序成功*/ return (head); } /*插入記錄函數*/
STUDENT *insert(STUDENT *head,STUDENT *new) {STUDENT *p0,*p1,*p2; int n,sum1,i; p1=head; /*使p1指向第一個結點*/ p0=new; /*p0指向要插入的結點*/ printf("\nPlease enter a new record.\n"); /*提示輸入記錄信息*/ printf("Enter the grade:"); scanf("%s",new->grade); printf("Enter the name:"); scanf("%s",new->name); do{ printf("Enter the sex(M or W):"); scanf("%s",&new->sex[0]); if(new->sex[0]!='M'&&new->sex[0]!='W') printf("Data error,please enter again.\n"); }while(new->sex[0]!='M'&&new->sex[0]!='W'); printf("Please enter the %d scores.\n",3); sum1=0; /*保存新記錄的總分，初值為0*/ for(i=0;i<3;i++) { do{ printf("score%d:",i+1); scanf("%d",&new->score[i]); if(new->score[i]>100||new->score[i]<0) printf("Data error,please enter again.\n"); }while(new->score[i]>100||new->score[i]<0); sum1=sum1+new->score[i]; /*累加各門成績*/ } new->sum=sum1; /*將總分存入新記錄中*/ new->average=(float)sum1/3; new->order=0; if(head==NULL) /*原來的鏈表是空表*/ {head=p0;p0->next=NULL;} /*使p0指向的結點作為頭結點*/ else {while((p0->average<p1->average)&&(p1->next!=NULL)) {p2=p1; /*使p2指向剛才p1指向的結點*/ p1=p1->next; /*p1后移一個結點*/ } if(p0->average>=p1->average) {if(head==p1)head=p0; /*插到原來第一個結點之前*/ else p2->next=p0; /*插到p2指向的結點之后*/ p0->next=p1;} else {p1->next=p0;p0->next=NULL;} /*插到最后的結點之后*/ } n=n+1; /*結點數加1*/ head=sort(head); /*調用排序的函數,將學生成績重新排序*/ printf("\nStudent %s have been inserted.\n",new->name); printf("Don't forget to save the new file.\n"); return(head); } /*統計學生成績函數*/ STUDENT *statistciam(STUDENT *head) { float sum1=0,sum2=0,sum3=0,ave1=0,ave2=0,ave3=0,max=0,min; STUDENT *p; int x,y=0,i=0; p=head;
printf("1.sum and average\n2.single of average\n3.max of sum\n4.min of sum\n"); scanf("%d",&x); getchar(); switch(x)
/*用switch語句實現功能選擇*/ { case 1: if(head==NULL) {printf("\n There are not anyone's information !\n");return(head);}/*鏈表為空*/ else { printf("---------------------------------------------------------\n"); printf("|Grade\t|Name\t|Sc1\t|Sc2\t|Sc3\t|Sum\t|Ave\t|\n"); printf("---------------------------------------------------------\n");/*打印表格域*/ while(p!=NULL) { sum1=p->score[0]+p->score[1]+p->score[2]; /*計算個人總分*/ ave1=sum1/3;/*計算個人平均分*/ printf("|%s\t|%s\t|%.1d\t|%.1d\t|%.1d\t|%.1f\t|%.1f\t|\n",p->grade,p->name,p->score[0],p->score[1],p->score[2],sum1,ave1); /*打印結果*/ printf("---------------------------------------------------------\n");/*打印表格域*/ p=p->next;} } return(head);
case 2: if(head==NULL)
{printf("\nThere are not anyone's information !\n");return(head);}/*鏈表為空*/ while(p!=NULL) { sum1=sum1+p->score[0]; sum2=sum2+p->score[1]; sum3=sum3+p->score[2];/*計算總分*/ y=y+1; ave1=sum1/y; ave2=sum2/y; ave3=sum3/y;/*計算平均分*/ p=p->next;/*使p指向下一個結點*/ } printf("score1 average is%.1f\n",ave1); printf("score2 average is%.1f\n",ave2); printf("score3 average is%.1f\n",ave3);/*打印結果*/ return(head); case 3: if(head==NULL) {printf("\nThere are not anyone's information !\n");return(head);}/*鏈表為空*/ max=p->score[0]+p->score[1]+p->score[2]; while(i<N) { i=i+1; sum1=p->score[0]+p->score[1]+p->score[2]; /*計算個人總分*/ if(max<sum1) max=sum1; p=p->next; } printf("max of sum:%.1f",max); printf("\n"); return(head); case 4: if(head==NULL) {printf("\nThere are not anyone's information !\n");return(head);}/*鏈表為空*/ while(p!=NULL) { min=p->score[0]+p->score[1]+p->score[2]; while(p!=NULL) {sum2=p->score[0]+p->score[1]+p->score[2]; if(min>sum2) min=sum2; p=p->next; } } printf("min of sum:%.1f",min); printf("\n"); return(head); default :printf("Data error,please enter again!\n"); } return(head); } |
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