diff --git a/task 5.c b/task 5.c
deleted file mode 100644
index 22ebfbe..0000000
--- a/task 5.c	
+++ /dev/null
@@ -1,100 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-struct Student{
-		char stunumber[5];
-		int class;
-		char name[10];
-		float grade1;
-		float grade2;
-		float grade3;
-		float sum;
-		}students[3]={{"10001",11,"Zhang",99.5,88.5,89.5,99.5+88.5+99.5},
-			{"10002",12,"Yang",77.9,56.5,87.5,77.9+56.5+87.5},
-			{"10003",11,"Liang",92.5,99.0,60.5,92.5+99.0+60.5}};
-void selection_sort(struct Student arr[], int n) {
-    int i, j, min_idx;
-    //一一检索每个结构体中class的值 
-    for (i = 0; i < n-1; i++) {
-        // 找到最小值的位置 
-        min_idx = i;
-        for (j = i+1; j < n; j++)
-        {
-		
-            if (arr[j].class < arr[min_idx].class)
-            {
-                min_idx = j;
-       		}
-       		else if(arr[j].class == arr[min_idx].class)
-       		{
-       			if(arr[j].sum == arr[min_idx].sum)
-       			{
-       				min_idx=j;
-				}
-			}
-		}
-        // 通过交换位置实现排序
-        struct Student temp = arr[min_idx];
-        arr[min_idx] = arr[i];
-        arr[i] = temp;
-    }
-}
-// 打印学生信息
-void print_student(struct Student arr[]) {
-	for(int i=0;i < 3;i++)
-    	printf("%s %d %s %.1f %.1f %.1f \n", students[i].stunumber, students[i].class, students[i].name, students[i].grade1, students[i].grade2, students[i].grade3);
-}
-int main()
-{
-		int n=3;
-		void selection_sort(struct Student arr[], int n); 
-		selection_sort(students,3);//排序 
-		
-		printf("Are you sure(yes/no)?\n");
-    	char ans;
-    	scanf("%s", &ans);
-	    if(ans != 'y') {
-	        // 用户不确认删除
-	        printf("Sorted Students:\n");
-	    	for(int i = 0; i < 3; i++) {
-	        printf("%s %d %s %.1f %.1f %.1f \n", students[i].stunumber, students[i].class, students[i].name, students[i].grade1, students[i].grade2, students[i].grade3);
-			 
-			}	
-			return 0;
-	    }
-	    printf("Enter student number or name to be deleted: ");
-	    char num_or_name[10];
-	    scanf("%s", num_or_name);
-	
-	    // 查找要删除的学生索引
-	    int target_idx = -1;
-	    for(int i = 0; i < 3; i++) {
-	        if(strcmp(num_or_name, students[i].stunumber) == 0 || strcmp(num_or_name, students[i].name) == 0) {
-	            target_idx = i;
-	            break;
-	        }
-	    }
-	    if(target_idx == -1) {
-    		printf("The student does not exist!\n");
-    		// 输出所有学生信息
-    		for(int i = 0; i < 3; i++) {
-        		printf("%s %d %s %.1f %.1f %.1f \n", students[i].stunumber, students[i].class, students[i].name, students[i].grade1, students[i].grade2, students[i].grade3);
-			 
-			}
-			return 0;
-    	}
-    			
-		
-		// 移除目标学生
-	    memmove(&students[target_idx], &students[target_idx + 1], sizeof(students) * (3 - target_idx - 1));
-	
-	    // 输出移除后学生信息
-	    printf("Students after deletion:\n");
-	    for(int i = 0; i < 2; i++) {
-	        printf("%s %d %s %.1f %.1f %.1f \n", students[i].stunumber, students[i].class, students[i].name, students[i].grade1, students[i].grade2, students[i].grade3);
-		}
-	    return 0;
-}
-	
-