diff --git a/7.c b/7.c
new file mode 100644
index 0000000..9737e5e
--- /dev/null
+++ b/7.c
@@ -0,0 +1,136 @@
+#include <stdio.h>
+#include <string.h>
+int cnt=0;
+struct student{
+	int clas;
+    char id[20],name[20];
+    double score1,score2,score3,total;
+}s[10];
+
+void input(){
+	int i,j;
+	for(i=0;i<7;i++){
+		scanf("%s%d%s%lf%lf%lf",s[i].id,&s[i].clas,s[i].name,&s[i].score1,&s[i].score2,&s[i].score3);
+		cnt++;
+		s[i].total=s[i].score1+s[i].score2+s[i].score3;
+	}
+
+}
+
+void select(){
+	int n,i,j;
+	scanf("%d",&n);
+	if(n==1){
+		int clas1,clas2;
+		scanf("%d-%d",&clas1,&clas2);
+		for(i=0;i<cnt;i++){
+			if(s[i].clas>=clas1&&s[i].clas<=clas2){
+				output(i);
+			}
+		}
+	}
+	else if(n==2){
+		char range[40],id1[20],id2[20]={};
+		scanf("%s",range);
+		for(i=0;i<strlen(range);i++){
+			if(range[i]=='-'){
+				strncpy(id1,range,i);
+				int t=0;
+				for(i++;i<strlen(range);i++){
+					id2[t++]=range[i];
+				}
+				break;
+			}
+		}
+		for(i=0;i<cnt;i++){
+			if(strcmp(s[i].id,id1)>=0&&strcmp(s[i].id,id2)<=0){
+				output(i);
+			}
+		}		
+	}
+	else if(n==3){
+		char capital[20];
+		scanf("%s",capital);
+		for(i=0;i<cnt;i++){
+			int flag=1;
+			for(j=0;j<strlen(capital)-1;j++){
+				if(s[i].name[j]!=capital[j]){
+					flag=0;
+					break;
+				}
+			}
+			if(flag) output(i);
+		}
+	}
+	else if(n==4){
+		double score;
+		scanf("%lf",&score);
+		for(i=0;i<cnt;i++){
+			if(s[i].total>=score) output(i);
+		}
+	}
+	else if(n==5){
+		int clas;
+		char range[40],id1[20]={},id2[20]={};
+		scanf("%s",range);
+		clas=10*(range[0]-'0')+range[1]-'0';
+		for(i=0;i<strlen(range);i++){
+			if(range[i]=='.'){
+				int t=0;
+				for(i++;i<strlen(range);i++){
+					if(range[i]=='-') break;
+					id1[t++]=range[i];
+				}
+				t=0;
+				for(i++;i<strlen(range);i++){
+					id2[t++]=range[i];
+				}
+				break;
+			}
+		}
+		for(i=0;i<cnt;i++){
+			if(s[i].clas==clas&&strcmp(s[i].id,id1)>=0&&strcmp(s[i].id,id2)<=0){
+				output(i);
+			}
+		}
+	}
+
+}
+
+void order(){
+	int i,j;
+	for(i=0;i<cnt-1;i++){
+		for(j=0;j<cnt-i-1;j++){
+			if(s[j].clas>s[j+1].clas||(s[j].clas==s[j+1].clas&&s[j].total<s[j+1].total)){
+				struct student t;
+				t=s[j];
+				s[j]=s[j+1];
+				s[j+1]=t;
+			}
+		}
+	}	
+}
+
+void output(int i){
+	printf("%s %d %s %.1f %.1f %.1f\n",s[i].id,s[i].clas,s[i].name,s[i].score1,s[i].score2,s[i].score3);
+}
+
+int main(){
+	input();
+	order();
+	int i;
+	for(i=1;i<=5;i++) select();
+	return 0;
+}
+//10001 11 Zhang 99.5 88.5 89.5
+//10002 12 Yang 77.9 56.5 87.5
+//10003 11 Liang 92.5 99.0 60.5
+//10004 11 Cai 89.6 56.9 90.5
+//10005 14 Fu 55.6 67.9 98.9
+//10006 12 Mao 22.1 45.9 99.2
+//10007 13 Zhan 35.6 67.9 88.0
+//1 11-13
+//2 10001-10004
+//3 Zh*
+//4 98.0
+//5 11.10001-10004