diff --git a/operations.c b/operations.c
index 7ad054a..1e7e81d 100644
--- a/operations.c
+++ b/operations.c
@@ -94,48 +94,84 @@ void cancel(ss*stu){
 //修改学生信息
 void ModifyInfo(ss *stu)
 {
-  int len = stu->nums;
-	Student new_stu_info;
-	scanf("%s%s%s%lf%lf%lf", &new_stu_info.id, &new_stu_info.clas, &new_stu_info.name, &new_stu_info.score1, &new_stu_info.score2, &new_stu_info.score3);
-	for (int i = 0; i < len; i++) {
-		if (strcmp(new_stu_info.id, stu->student[i].id) == 0) {
-			stu->student[i] = new_stu_info;
-		}
-	}
-	char *max = malloc(sizeof(char)*20), *min = malloc(sizeof(char)*20);
-	strcpy(max, stu->student[0].clas);
-	strcpy(min, stu->student[0].clas);
-	for (int i = 0; i < len; i++) {
-		if (stu->student[i].clas > max) {
-			strcpy(max, stu->student[i].clas);
-		}
-		if (stu->student[i].clas < min) {
-			strcpy(min, stu->student[i].clas);
-		}
-	}
-	int i = 0, flag = 0;
-	while (strcmp(min, max) != 1) {
-		while (i < len && strcmp(min, stu->student[i++].clas) == 0) {
-			if (flag == 1) {
-				if (strcmp(stu->student[i].id, new_stu_info.id) == 0) {
-					printf("   %s %s %lf %lf %lf modified\n", stu->student[i].id, stu->student[i].name, stu->student[i].score1, stu->student[i].score2, stu->student[i].score3);
-				}
-				else
-					printf("   %s %s %lf %lf %lf\n", stu->student[i].id, stu->student[i].name, stu->student[i].score1, stu->student[i].score2, stu->student[i].score3);
-			}
-			else {
-				flag = 1;
-				if (strcmp(stu->student[i].id, new_stu_info.id) == 0) {
-					printf("%s %s %s %lf %lf %lf modified\n", stu->student[i].clas, stu->student[i].id, stu->student[i].name, stu->student[i].score1, stu->student[i].score2, stu->student[i].score3);
-				}
-				else
-					printf("%s %s %s %lf %lf %lf modified\n", stu->student[i].clas, stu->student[i].id, stu->student[i].name, stu->student[i].score1, stu->student[i].score2, stu->student[i].score3);
-			}
-		}
-		min = min + 1;
-	}
-}
+    char tmp[5];
+    do {
+        int len = stu->nums;
+        Student* new_stu_info = newStudent();
+
+        printf("Id  ");
+        scanf("%s", new_stu_info->id);
+        printf("\n");
+
+        printf("class  ");
+        scanf(" %s", new_stu_info->clas);
+        printf("\n");
+
+        printf("name  ");
+        scanf(" %s", new_stu_info->name);
+        printf("\n");
+
+        printf("score1  ");
+        scanf("%lf", &new_stu_info->score1);
+        printf("\n");
+
+        printf("score2  ");
+        scanf("%lf", &new_stu_info->score2);
+        printf("\n");
 
+        printf("score3  ");
+        scanf("%lf", &new_stu_info->score3);
+        printf("\n");
+
+        for (int i = 0; i < len; i++) {
+            if (strcmp(new_stu_info->id, stu->student[i].id) == 0) {
+                stu->student[i] = new_stu_info[0];
+                stu->student[i].score = stu->student[i].score1 + stu->student[i].score2 + stu->student[i].score3;
+            }
+        } 
+
+        char* max = malloc(sizeof(char) * 4), * min = malloc(sizeof(char) * 4);
+        strcpy(max, stu->student[0].clas);
+        strcpy(min, stu->student[0].clas);
+
+        for (int i = 0; i < len; i++) {
+            if (strcmp(stu->student[i].clas , max)>0) {
+                strcpy(max, stu->student[i].clas);
+            }
+            if (strcmp(stu->student[i].clas , min)<0) {
+                strcpy(min, stu->student[i].clas);
+            }
+        }
+        int i = 0, flag = 0;
+        do {
+            while (i < len && strcmp(min, stu->student[i].clas) == 0) {
+                if (flag == 1) {
+                    if (strcmp(stu->student[i].id, new_stu_info->id) == 0) {
+                        printf("   %s %s %.1lf %.1lf %.1lf modified\n", stu->student[i].id, stu->student[i].name, stu->student[i].score1, stu->student[i].score2, stu->student[i].score3);
+                    }
+                    else
+                        printf("   %s %s %.1lf %.1lf %.1lf\n", stu->student[i].id, stu->student[i].name, stu->student[i].score1, stu->student[i].score2, stu->student[i].score3);
+                }
+                else {
+                    flag = 1;
+                    if (strcmp(stu->student[i].id, new_stu_info->id) == 0) {
+                        printf("%s %s %s %.1lf %.1lf %.1lf modified\n", stu->student[i].clas, stu->student[i].id, stu->student[i].name, stu->student[i].score1, stu->student[i].score2, stu->student[i].score3);
+                    }
+                    else
+                        printf("%s %s %s %.1lf %.1lf %.1lf\n", stu->student[i].clas, stu->student[i].id, stu->student[i].name, stu->student[i].score1, stu->student[i].score2, stu->student[i].score3);
+                }
+                i++;
+            }
+            int class = atoi(min);
+            class++;
+            itoa(class,min,10);
+        } while (strcmp(max, min) >= 0);
+        printf("continue?\n");
+        scanf("%s", tmp);
+    }while (!strcmp(tmp, "yes"));
+
+    return;
+}
 //排序
 void Order(ss *stu){
   for(int i=0;i<stu->nums;i++){