diff --git a/mysyslib.h b/mysyslib.h
index 4c7ec14..04adab5 100644
--- a/mysyslib.h
+++ b/mysyslib.h
@@ -1,6 +1,7 @@
 #include<stdio.h>
 #include<stdlib.h>
 #include<string.h>
+#include<stdlib.h>
 
 typedef struct{
     char *id;
@@ -17,11 +18,7 @@ typedef struct{
     int nums;
 }ss;
 
-ss* init(int);
-Student* newStudent();
-void stucpy(Student* dest, Student* src);
-void stuswp(Student* fi, Student* se);
-int mainMenu(ss *stu);
+ss* init(int)
 void ModifyInfo(ss* stu);
 void getCom(ss*);
 void Print(Student*);
diff --git a/operations.c b/operations.c
index 1e7e81d..12c8568 100644
--- a/operations.c
+++ b/operations.c
@@ -49,9 +49,9 @@ void input(ss*stu){
         stu->student[pst].score = stu->student[pst].score1 + stu->student[pst].score2 + stu->student[pst].score3;
         stu->nums++;
         
-        printf("continue?\n");
+        printf("continue?(y/n)\n");
         scanf("%s",tmp);
-    }while(!strcmp(tmp,"yes"));
+    }while(!strcmp(tmp,"y"));
     
     return;
 }
@@ -164,11 +164,11 @@ void ModifyInfo(ss *stu)
             }
             int class = atoi(min);
             class++;
-            itoa(class,min,10);
+            sprintf(min,"%d",class);
         } while (strcmp(max, min) >= 0);
-        printf("continue?\n");
+        printf("continue?(y/n)\n");
         scanf("%s", tmp);
-    }while (!strcmp(tmp, "yes"));
+    }while (!strcmp(tmp, "y"));
 
     return;
 }