diff --git a/T2 enrollment management system.c b/T2 enrollment management system.c
new file mode 100644
index 0000000..296da35
--- /dev/null
+++ b/T2 enrollment management system.c	
@@ -0,0 +1,283 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+//初始化声明
+ 
+int addnum=0;
+struct info{
+	int number;
+	int clas;
+	char name[20];
+	float math;
+	float physic;
+	float english;
+	float grade;
+};
+struct info stu[20];
+int judge();
+void swap(int i,int j);
+void initial();
+void ind();
+void inputinfop1();
+void deleteinfop2();
+void selectinfop3();
+void rangeinfop4();
+void printinfop5();
+
+//主程序
+ 
+int main(){
+	initial();
+	int in;
+	while(1){
+	ind();
+	scanf("%d",&in);
+	switch(in){
+		case 1:
+		printf("You are trying to Input info\n");
+		inputinfop1();break;
+		case 5:
+		printf("You are trying to Output info\n");
+		printinfop5();break;
+		case 4:
+		printf("You are trying to Make things ordered\n");
+		rangeinfop4();
+		break;
+		case 6:
+		printf("You are about to Quit\n");return 0;
+		case 2:deleteinfop2();break;
+		case 3:selectinfop3();break;
+		default:
+		printf("Wrong input\n");break;
+	}
+	}
+	
+	return 0;
+} 
+
+
+//初始化ini
+ 
+void initial(){
+	int i;	
+	for(i=0;i<20;i++){
+		stu[i].number=0;
+		stu[i].math=0.0;
+		stu[i].physic=0.0;
+		stu[i].english=0.0;
+		stu[i].clas=0;
+		memset(stu[i].name,0,sizeof(stu[i].name));
+	}
+	return;
+}
+
+//输入步骤
+ 
+void inputinfop1(){
+	int j,k,l,temp,num=0;
+	char str[10];
+	float total[2][20];
+	memset(total,0,sizeof(total));
+	do{
+		printf("Id ");
+		scanf("%d",&stu[addnum].number);
+		printf("class ");
+		scanf("%d",&stu[addnum].clas);
+		printf("name ");
+		scanf("%s",&stu[addnum].name);
+		printf("score1 ");
+		scanf("%f",&stu[addnum].math);
+		printf("score2 ");
+		scanf("%f",&stu[addnum].physic);
+		printf("score3 ");
+		scanf("%f",&stu[addnum].english);
+		stu[addnum].grade=stu[addnum].math+stu[addnum].physic+stu[addnum].english;
+		total[1][addnum]=stu[addnum].grade;
+		total[0][addnum]=addnum;
+		addnum++;
+		num++;
+		if(judge()){
+			continue;
+		}
+		else{
+			break;
+		}
+	}while(1);
+	//排序 
+	//	
+	
+}
+
+//rangeinfo
+
+void rangeinfop4(){
+	int i,j,k,l=0,num=addnum,clas[20];
+	float grade[20];
+	for(i=0;i<num;i++){
+		clas[i]=stu[i].clas;
+		grade[i]=stu[i].grade;
+	}
+	for(j=0;j<num-1;j++){
+		for(k=0;k<num-1;k++){
+			if(clas[k]>clas[k+1]){
+				swap(k,k+1);
+			}
+		}
+	}
+	while(clas[l]==clas[l+1]&&l<num-1){
+		if(grade[l]<grade[l+1]){
+			swap(l,l+1);
+		}
+		l++;
+	}
+	printinfop5();
+}
+
+//selectinfo
+
+void selectinfop3(){
+	int j,num=addnum,jud=1;
+	char selnum[20];
+	while(1){
+		scanf("%s",&selnum);
+		for(j=0;j<num;j++){
+			if((atoi(selnum)==stu[j].number)||(atoi(selnum)==stu[j].clas)){
+				printf("%d,%d,%s,%.1f,%.1f,%.1f,%.1f\n",stu[j].number,stu[j].clas,stu[j].name,stu[j].math,stu[j].physic,stu[j].english,stu[j].grade);
+				jud=0;
+			}
+		}
+		if(jud){
+			printf("there is no eligible student \n");
+		}
+	if(judge()){
+		continue;
+	}
+	else{
+		break;
+	}
+	}
+}
+
+//deleteinfo
+
+void deleteinfop2(){
+	int num=addnum,i,j;
+	char delnum[20];
+	while(1){
+		scanf("%s",&delnum);
+	if(delnum[0]>='0'&&delnum[0]<='9'){
+		for(i=0;i<num;i++){
+			if(atoi(delnum)==stu[i].number){
+				for(j=i;j<num-1;j++){
+					stu[j].number=stu[j+1].number;
+					stu[j].clas=stu[j+1].clas;
+					strcpy(stu[j].name,stu[j+1].name);
+					stu[j].math=stu[j+1].math;
+					stu[j].english=stu[j+1].english;
+					stu[j].physic=stu[j].physic;
+					stu[j].grade=stu[j+1].grade;	
+				}
+				addnum--;
+				break;
+			}
+		}
+	}
+	else{
+		for(i=0;i<num;i++){
+			if(strcmp(delnum,stu[i].name)==0){
+				for(j=i;j<num-1;j++){
+					stu[j].number=stu[j+1].number;
+					stu[j].clas=stu[j+1].clas;
+					strcpy(stu[j].name,stu[j+1].name);
+					stu[j].math=stu[j+1].math;
+					stu[j].english=stu[j+1].english;
+					stu[j].physic=stu[j].physic;
+					stu[j].grade=stu[j+1].grade;	
+				}
+				addnum--;
+				break;
+			}
+		}
+	}
+	if(judge()){
+		continue;
+	}
+	else{
+		break;
+	}
+	}
+	
+	
+	printinfop5();
+}
+//索引
+
+void ind(){
+	int i,j;
+	printf("\n");
+	for(i=1;i<=6;i++){
+		printf("%d.",i);
+		switch(i){
+			case 1:printf("input\n");break;
+			case 2:printf("delete\n");break;
+			case 3:printf("select\n");break;
+			case 4:printf("order\n");break;
+			case 5:printf("output\n");break;
+			case 6:printf("quit\n");break;
+		}
+	}
+	printf("please input your option");
+} 
+
+//输出info
+
+void printinfop5(){
+	int j;
+	for(j=0;j<addnum;j++){
+		printf("%d,%d,%s,%.1f,%.1f,%.1f,%.1f\n",stu[j].number,stu[j].clas,stu[j].name,stu[j].math,stu[j].physic,stu[j].english,stu[j].grade);
+	}
+} 
+
+//继续输入?
+
+int judge(){
+	char judge[]="yes",str[20];
+	printf("continue?\n");
+		scanf("%s",&str);
+		if((int)strcmp(str,judge)==0){
+			return 1;
+		}
+		else{
+			return 0;
+		} 
+}
+
+//swap
+
+void swap(int i,int j){
+	int tempint;
+	char tempchar[20];
+	float tempfloat;
+	tempint=stu[i].number;
+	stu[i].number=stu[j].number;
+	stu[j].number=tempint;
+	tempint=stu[i].clas;
+	stu[i].clas=stu[j].clas;
+	stu[j].clas=tempint;
+	strcpy(tempchar,stu[i].name);
+	strcpy(stu[i].name,stu[j].name);
+	strcpy(stu[j].name,tempchar);
+	tempfloat=stu[i].english;
+	stu[i].english=stu[j].english;
+	stu[j].english=tempfloat;
+	tempfloat=stu[i].math;
+	stu[i].math=stu[j].math;
+	stu[j].math=tempfloat;
+	tempfloat=stu[i].physic;
+	stu[i].physic=stu[j].physic;
+	stu[j].physic=tempfloat;
+	tempfloat=stu[i].grade;
+	stu[i].grade=stu[j].grade;
+	stu[j].grade=tempfloat;
+}