diff --git a/q8.c b/q8.c
deleted file mode 100644
index 956b05b..0000000
--- a/q8.c
+++ /dev/null
@@ -1,99 +0,0 @@
-#include<stdio.h>
-#include<string.h>
-#include<math.h>
-#include<stdlib.h>
-struct stud
-{
-char id[20];
-char clas[20];
-char name[20];
-double score1;
-double score2;
-double score3;
-double score;
-};int SSS;int rak[20];
-int main()
-{struct stud stu[10];
-void men();void inpu(struct stud stu[10],int n[1]);void del(struct stud stu[10],int n[1]);void sel(struct stud stu[10],int n[1]);
-void ord(struct stud stu[10],int n[1]);void out(struct stud stu[10],int n[1]);
-int n[1];int i;
-for(i=0;i<20;i++){rak[i]=i;}
-start:
-men();scanf("%d",&i);
-switch(i)
-{case 1:inpu(stu,n);goto start;
- case 2:del(stu,n);goto start;
- case 3:sel(stu,n);goto start;
- case 4:ord(stu,n);goto start;
- case 5:out(stu,n);goto start;
- case 6:break;	
-}
-return 0;
-}
-
-void men()
-{printf("\n1.input\n2.delete\n3.select\n4.order\n5.output\n6.quit\nplease input your option\n");}
-
-void inpu(struct stud stu[10],int n[1])
-{int i=0,p=1;char a[20];
-while(p)
-{printf("Id ");scanf("%s",&stu[i].id);
-printf("class ");scanf("%s",&stu[i].clas);
-printf("name ");scanf("%s",&stu[i].name);
-printf("score1 ");scanf("%lf",&stu[i].score1);
-printf("score2 ");scanf("%lf",&stu[i].score2);
-printf("score3 ");scanf("%lf",&stu[i].score3);
-printf("continue?\n");
-while(1){scanf("%s",&a);
-if(strcmp(a,"no")==0){p=0;n[0]=SSS=i;break;}else if(strcmp(a,"yes")==0){break;}else{printf("please input yes/no\n");}}
-i++;
-}}
-
-void del(struct stud stu[10],int n[1])
-{char a[20];int i,p=1;
-while(p)
-{scanf("%s",&a);
-for(i=0;i<=n[0];i++)
-{if(strcmp(a,stu[i].id)==0||strcmp(a,stu[i].name)==0){break;}}
-if(i<=n[0]&&SSS)
-{strcpy(stu[i].id,"");strcpy(stu[i].clas,"");strcpy(stu[i].name,"");stu[i].score1=0;stu[i].score2=0;stu[i].score3=0;SSS--;}
-for(i=0;i<=n[0];i++)
-{if(stu[i].score1!=0)
-{printf("%s %s %s %3.1f %3.1f %3.1f\n",stu[i].id,stu[i].clas,stu[i].name,stu[i].score1,stu[i].score2,stu[i].score3);}}
-printf("continue?\n");
-while(1){scanf("%s",&a);
-if(strcmp(a,"no")==0){p=0;break;}else if(strcmp(a,"yes")==0){break;}else{printf("please input yes/no\n");}}
-}for(i=0;i<20;i++){rak[i]=i;}}
-
-void sel(struct stud stu[10],int n[1])
-{int i,p=1,t;char a[20];
-while(p)
-{scanf("%s",&a);
-t=1;
-for(i=0;i<=n[0];i++)
-{if(strcmp(a,stu[i].id)==0||strcmp(a,stu[i].clas)==0)
-{t=0;printf("%s %s %s %3.1f %3.1f %3.1f\n",stu[i].id,stu[i].clas,stu[i].name,stu[i].score1,stu[i].score2,stu[i].score3);}}
-if(t){printf("there is no eligible student\n");}printf("continue?\n");
-while(1){scanf("%s",&a);
-if(strcmp(a,"no")==0){p=0;break;}else if(strcmp(a,"yes")==0){break;}else{printf("please input yes/no\n");}}
-}}
-
-void ord(struct stud stu[10],int n[1])
-{int i,j,k,a,b;int mark[20];
-for(i=0;i<=n[0];i++){mark[i]=0;stu[i].score=stu[i].score1+stu[i].score2+stu[i].score3;}
-for(i=0;i<=SSS;i++)	
-{for(k=0,j=0;j<=n[0]&&k<=n[0];)
-{if(mark[j]||stu[j].score1==0){j++;continue;}if(mark[k]||stu[k].score1==0){k++;continue;}
-a=atoi(stu[j].clas);b=atoi(stu[k].clas);
-if(a<b){k=j;}if(a==b&&stu[j].score>stu[k].score){k=j;}j++;continue;	
-}rak[i]=k;mark[k]=1;	
-}
-for(i=0;i<=SSS;i++)
-{j=rak[i];
-printf("%s %s %s %3.1f %3.1f %3.1f\n",stu[j].id,stu[j].clas,stu[j].name,stu[j].score1,stu[j].score2,stu[j].score3);	
-}}
-
-void out(struct stud stu[10],int n[1])
-{int i,j;
-for(i=0;i<=SSS;i++)
-{j=rak[i];printf("%s %s %s %3.1f %3.1f %3.1f\n",stu[j].id,stu[j].clas,stu[j].name,stu[j].score1,stu[j].score2,stu[j].score3);}}