#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#include<dos.h>
#include<string.h>
#define LEN sizeof(struct student)
#define FORMAT "%-8d%-15s%-12.1lf%-12.1lf%-12.1lf%-12.1lf\n"
#define DATA stu[i].num,stu[i].name,stu[i].elec,stu[i].expe,stu[i].requ,stu[i].sum
struct student/*定義學生成績結構體*/
{ int num;/*學號*/
char name[15];/*姓名*/ double elec;/*選修課*/ double expe;/*實驗課*/ double requ;/*必修課*/ double sum;/*總分*/};
struct student stu[50];/*定義結構體數組*/
void in();/*錄入學生成績信息*/
void show();/*顯示學生信息*/
void order();/*按總分排序*/
void del();/*刪除學生成績信息*/
void modify();/*修改學生成績信息*/
void menu();/*主菜單*/
void insert();/*插入學生信息*/
void total();/*計算總人數*/
void search();/*查找學生信息*/
void main()/*主函數*/
{ int n;
menu(); scanf("%d",&n);/*輸入選擇功能的編號*/ while(n) { switch(n)?{ case 1: in();break;
case 2: search();break;
case 3: del();break;
case 4: modify();break;
case 5: insert();break;
case 6: order();break;
case 7: total();break;
? case 8: show();break;
default:break;
?}
getch();
menu();/*執行完功能再次顯示菜單界面*/
scanf("%d",&n);
}}
void in()/*錄入學生信息*/
{ int i,m=0;/*m是記錄的條數*/
char ch[2]; FILE *fp;/*定義文件指針*/ if((fp=fopen("data.txt","a+"))==NULL)/*打開指定文件*/ {??printf("can not open\n");
?return;
} while(!feof(fp)) {?if(fread(&stu[m] ,LEN,1,fp)==1)
?m++;/*統計當前記錄條數*/
} fclose(fp); if(m==0)?printf("No record!\n");
else {?system("cls");
? show();/*調用show函數，顯示原有信息*/
} if((fp=fopen("data.txt","wb"))==NULL) {?printf("can not open\n");
?return;
} for(i=0;i<m;i++)fwrite(&stu[i] ,LEN,1,fp);/*向指定的磁盤文件寫入信息*/
printf("please input(y/n):"); scanf("%s",ch);while(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)/*判斷是否要錄入新信息*/
{
printf("number:");
scanf("%d",&stu[m].num);/*輸入學生學號*/
for(i=0;i<m;i++)
if(stu[i].num==stu[m].num)
{
printf("the number is existing,press any to continue!");
getch();
fclose(fp);
return;
}
?printf("name:");
scanf("%s",stu[m].name);/*輸入學生姓名*/
?printf("elective:");
?scanf("%lf",&stu[m].elec);/*輸入選修課成績*/
?printf("experiment:");
scanf("%lf",&stu[m].expe);/*輸入實驗課成績*/
?printf("required course:");
scanf("%lf",&stu[m].requ);/*輸入必修課成績*/
?stu[m].sum=stu[m].elec+stu[m].expe+stu[m].requ;/*計算出總成績*/
?if(fwrite(&stu[m],LEN,1,fp)!=1)/*將新錄入的信息寫入指定的磁盤文件*/
?{
printf("can not save!");
getch();
}
?else
{
printf("%s saved!\n",stu[m].name);
m++;
}
?printf("continue?(y/n):");/*詢問是否繼續*/
?scanf("%s",ch);
} fclose(fp); printf("OK!\n");}
void show()
{ FILE *fp;int i,m=0;
fp=fopen("data.txt","rb");
while(!feof(fp))
{
if(fread(&stu[m] ,LEN,1,fp)==1)?
m++;
} ?
fclose(fp);
printf("number ?name ? elective experiment ?required sum\t\n");
for(i=0;i<m;i++)
{?
? printf(FORMAT,DATA);/*將信息按指定格式打印*/
}
?}
void menu()/*自定義函數實現菜單功能*/
{
system("cls"); printf("\n\n\n\n\n"); printf("\t\t|---------------------STUDENT-------------------|\n"); printf("\t\t|\t 0. exit |\n"); printf("\t\t|\t 1. input record |\n"); printf("\t\t|\t 2. search record ? |\n"); printf("\t\t|\t 3. delete record ? |\n"); printf("\t\t|\t 4. modify record ? |\n"); printf("\t\t|\t 5. insert record ? |\n"); printf("\t\t|\t 6. order ? |\n"); printf("\t\t|\t 7. number ?|\n"); printf("\t\t|\t 8. show |\n"); printf("\t\t|-----------------------------------------------|\n\n"); printf("\t\t\tchoose(0-8):");}
void order()/*自定義排序函數*/
{ FILE *fp;
struct student t; int i=0,j=0,m=0; if((fp=fopen("data.txt","r+"))==NULL)?{?
printf("can not open!\n");
return;
} while(!feof(fp))? if(fread(&stu[m] ,LEN,1,fp)==1)??m++;
fclose(fp); if(m==0)? {?printf("no record!\n");
?return;
} if((fp=fopen("data.txt","wb"))==NULL)?{
?printf("can not open\n");
?return;}
for(i=0;i<m-1;i++)? for(j=i+1;j<m;j++)/*雙重循環實現成績比較並交換*/
? if(stu[i].sum<stu[j].sum)
? { t=stu[i];stu[i]=stu[j];stu[j]=t;}
?if((fp=fopen("data.txt","wb"))==NULL)
?{ printf("can not open\n");return;}
for(i=0;i<m;i++)/*將重新排好序的內容重新寫入指定的磁盤文件中*/? if(fwrite(&stu[i] ,LEN,1,fp)!=1)
{?
printf("%s can not save!\n");?
getch();
? }
fclose(fp); printf("save successfully\n");}
void del()/*自定義刪除函數*/
{FILE *fp;
int snum,i,j,m=0; char ch[2]; if((fp=fopen("data.txt","r+"))==NULL)?{ printf("can not open\n");return;}
while(!feof(fp)) ?if(fread(&stu[m],LEN,1,fp)==1) m++; fclose(fp); if(m==0)? {?printf("no record!\n");
?return;
} printf("please input the number:"); scanf("%d",&snum);for(i=0;i<m;i++)
?if(snum==stu[i].num)
break;
?printf("find the student,delete?(y/n)");
?scanf("%s",ch);
? if(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)/*判斷是否要進行刪除*/
? for(j=i;j<m;j++)
?stu[j]=stu[j+1];/*將後壹個記錄移到前壹個記錄的位置*/
? m--;/*記錄的總個數減1*/
? if((fp=fopen("data.txt","wb"))==NULL)
?{ printf("can not open\n");return;}
for(j=0;j<m;j++)/*將更改後的記錄重新寫入指定的磁盤文件中*/? if(fwrite(&stu[j] ,LEN,1,fp)!=1)
{ printf("can not save!\n");
? getch();}
fclose(fp); printf("delete successfully!\n");}
void search()/*自定義查找函數*/
{ FILE *fp;
int snum,i,m=0; char ch[2]; if((fp=fopen("data.txt","rb"))==NULL)?{ printf("can not open\n");return;}
while(!feof(fp)) ?if(fread(&stu[m],LEN,1,fp)==1) m++; fclose(fp); if(m==0) {printf("no record!\n");return;} printf("please input the number:"); scanf("%d",&snum); for(i=0;i<m;i++)?if(snum==stu[i].num)/*查找輸入的學號是否在記錄中*/
?{ printf("find the student,show?(y/n)");
?scanf("%s",ch);
? if(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)?
{
? printf("number ?name ? elective experiment ?required sum\t\n");
? printf(FORMAT,DATA);/*將查找出的結果按指定格式輸出*/
?break;
?}
?} ?
if(i==m) printf("can not find the student!\n");/*未找到要查找的信息*/}
void modify()/*自定義修改函數*/
{ FILE *fp;
int i,j,m=0,snum; if((fp=fopen("data.txt","r+"))==NULL)?{ printf("can not open\n");return;}
while(!feof(fp)) ? if(fread(&stu[m],LEN,1,fp)==1) m++; if(m==0) {printf("no record!\n"); fclose(fp); return; } show(); printf("please input the number of the student which do you want to modify!\n"); printf("modify number:"); scanf("%d",&snum); for(i=0;i<m;i++)?if(snum==stu[i].num)/*檢索記錄中是否有要修改的信息*/
?break;
?printf("find the student!you can modify!\n");
?
?printf("name:");
?scanf("%s",stu[i].name);/*輸入名字*/
? printf("elective:");
?scanf("%lf",&stu[i].elec);/*輸入選修課成績*/
? printf("experiment:");
?scanf("%lf",&stu[i].expe);/*輸入實驗課成績*/
? printf("required course:");
?scanf("%lf",&stu[i].requ);/*輸入必修課成績*/
?printf("modify successful!");
?stu[i].sum=stu[i].elec+stu[i].expe+stu[i].requ;
?if((fp=fopen("data.txt","wb"))==NULL)
?{ printf("can not open\n");return;}
?for(j=0;j<m;j++)/*將新修改的信息寫入指定的磁盤文件中*/
?if(fwrite(&stu[j] ,LEN,1,fp)!=1)
{ printf("can not save!"); getch(); }
fclose(fp); }void insert()/*自定義插入函數*/
{ FILE *fp;
int i,j,k,m=0,snum; if((fp=fopen("data.txt","r+"))==NULL)?{ printf("can not open\n");return;}
while(!feof(fp)) ? if(fread(&stu[m],LEN,1,fp)==1) m++; if(m==0) {printf("no record!\n"); fclose(fp); return; } printf("please input position where do you want to insert!(input the number)\n"); scanf("%d",&snum);/*輸入要插入的位置*/ for(i=0;i<m;i++)?if(snum==stu[i].num)
?break;
?for(j=m-1;j>i;j--)
stu[j+1]=stu[j];/*從最後壹條記錄開始均向後移壹位*/
?printf("now please input the new information.\n");
? printf("number:");
?scanf("%d",&stu[i+1].num);
?for(k=0;k<m;k++)
if(stu[k].num==stu[i+1].num)
{
printf("the number is existing,press any to continue!");
getch();
fclose(fp);
return;
}
?printf("name:");
?scanf("%s",stu[i+1].name);
? printf("elective:");
?scanf("%lf",&stu[i+1].elec);
? printf("experiment:");
?scanf("%lf",&stu[i+1].expe);
? printf("required course:");
?scanf("%lf",&stu[i+1].requ);
?stu[i+1].sum=stu[i+1].elec+stu[i+1].expe+stu[i+1].requ;
?if((fp=fopen("data.txt","wb"))==NULL)
?{ printf("can not open\n");return;}
?for(k=0;k<=m;k++)
?if(fwrite(&stu[k] ,LEN,1,fp)!=1)/*將修改後的記錄寫入磁盤文件中*/
{ printf("can not save!"); getch(); }
fclose(fp); }void total()
{ FILE *fp;
int m=0; if((fp=fopen("data.txt","r+"))==NULL)?{ printf("can not open\n");return;}
while(!feof(fp)) ??if(fread(&stu[m],LEN,1,fp)==1)?
?m++;/*統計記錄個數即學生個數*/
if(m==0) {printf("no record!\n");fclose(fp);return;} printf("the class are %d students!\n",m);/*將統計的個數輸出*/ fclose(fp); }