diff --git a/1.cpp b/1.cpp
index 190c209..a979128 100644
--- a/1.cpp
+++ b/1.cpp
@@ -6,21 +6,24 @@ class container {
 	int size;
 public:
 	float* p;
-	container(int s) :size(s){}
-	const int& getsize() { return size;}
-
+	container(int s) :size(s) {}
+	const int& getsize() { return size; }
+	const int& getsize() const { return size; }
 };
 
 class vector :public container {
 
 	int call_num;
 public:
-	explicit vector(int l) :len(l),size(1 * 100){
+	explicit vector(int l) :len(l), container(1 * 100) {
+		p = new float();
+	}
+	vector(const container& m) :len(10), container(m.getsize()) {
 		p = new float();
 	}
 	int len;
-	int& getlen() const {
-		call_num ++;
+	int& getlen() {
+		call_num++;
 		return len;
 	}
 	~vector() = default;
@@ -32,9 +35,10 @@ int main() {
 	vector v1 = c1;
 	container& r1 = v1;
 	container c2 = 100;
-	c2.getsize() = 20;
+	c2.getsize();
 	cout << c2.getsize();
-	vector v2 = 100;
-	v2.getlen = 40;
+	vector v2 = (vector)100;
+	v2.getlen() = 40;
 	cout << v2.getlen();
-}
\ No newline at end of file
+}
+//output after debug:10040
\ No newline at end of file
diff --git a/2.cpp b/2.cpp
index 6a27746..30d0477 100644
--- a/2.cpp
+++ b/2.cpp
@@ -5,11 +5,11 @@ using namespace std;
 
 // count all the specific char in the whole array of strings
 int countAllSpecificChars(string sArr[], int arrLength, char specificChar) {
-    int count;
-    for (int i = 0; i <= arrLength; ++i)
+    int count=0;
+    for (int i = 0; i < arrLength; ++i)
         for (int j = 0; j <= sArr[i].size(); ++j)
             // if the jth char of the string is the specific char
-            if (sArr[i][j] = specificChar)
+            if (sArr[i][j] == specificChar)
                 count++;
     return count;
 }
diff --git a/3.cpp b/3.cpp
index c8732ef..583ee9c 100644
--- a/3.cpp
+++ b/3.cpp
@@ -1,9 +1,12 @@
-#include<stdio.h>
+#pragma warning(disable : 4996)
+
+#include<stdio.h>
 #include<stdlib.h>
+#include<iostream>
 #define MAX_SIZE 200
 int arr[MAX_SIZE];
 
-typedef struct alfa * alfaptr;
+typedef struct alfa* alfaptr;
 
 struct alfa {
 	long long x;
@@ -15,8 +18,12 @@ void push(int x)
 	alfaptr node;
 	node = (alfaptr)malloc(sizeof(struct alfa));
 	node->x = x;
+	node->next = NULL;
 	if (!front)
+	{
 		front = node;
+		rear = node;
+	}
 	else {
 		rear->next = node;
 		rear = node;
@@ -31,6 +38,7 @@ void pop()
 	else
 	{
 		node = front->next;
+		free(front);
 		front = node;
 	}
 }
@@ -39,21 +47,31 @@ void search(int x)
 	alfaptr node = front;
 	int counter = 0;
 	while (node)
+	{
 		if (node->x == x)
-			printf("%d", counter);
+		{
+			counter++;
+			printf("%d\n", counter);
+		}
 		else {
-			printf("ERROR2");
-			break;
+			printf("ERROR4");
 		}
 		node = node->next;
+	}
 }
 
 void rpop() {//pop last element
-	alfaptr node = front;
-	while (node)
-		node = node->next;
-	free(rear);
-	rear = node;
+	if(front!=rear)
+	{
+		alfaptr node = front;
+		free(rear);
+		while (node->next != rear)
+			node = node->next;
+		rear = node;
+	}
+	else {
+		printf("ERROR3");
+		}
 }
 
 void set()
@@ -66,15 +84,17 @@ void set()
 int size()
 {
 	alfaptr node = front;
-	int count;
-	while (node)
-		count++;node = node->next;
+	int count=0;
+	while (node!=rear->next)
+	{
+		++count; node = node->next;
+	}
 	return count;
 }
 
 void show()
 {
-	if (!front) {
+	if (front) {
 		for (int i = 0; i < MAX_SIZE; i++)
 			printf("%d ", arr[i]);
 	}
@@ -88,7 +108,7 @@ int average()
 {
 
 	alfaptr node = front;
-	int sum = 0, count;
+	int sum = 0, count=0;
 	while (node) {
 		sum += node->x;
 		count++;
diff --git a/4.cpp b/4.cpp
index a9a32f2..e02c22e 100644
--- a/4.cpp
+++ b/4.cpp
@@ -6,4 +6,5 @@ int main()
     float *ptr2 = ptr1 + 3;
     printf("%f", *ptr2 - *ptr1);
     return 0;
-}
\ No newline at end of file
+}
+//no bug    output 78.000000
\ No newline at end of file
diff --git a/5.cpp b/5.cpp
index e9a1737..7762af5 100644
--- a/5.cpp
+++ b/5.cpp
@@ -7,4 +7,9 @@ int main()
     printf("%d\n", (*ptr2 - *ptr1));
     printf("%c", (char)(*ptr2 - *ptr1));
     return 0;
-}
\ No newline at end of file
+}
+
+//no bug
+//output
+//50
+//2
\ No newline at end of file
diff --git a/6.cpp b/6.cpp
index bb721c3..472b802 100644
--- a/6.cpp
+++ b/6.cpp
@@ -9,3 +9,7 @@ int main()
 	printf("%d\n", a);
 	return 0;
 }
+//no bug
+//output
+//513
+//  
diff --git a/7.cpp b/7.cpp
index 7b065a0..0031ee5 100644
--- a/7.cpp
+++ b/7.cpp
@@ -7,4 +7,7 @@ int main()
 	p += 2;
 	printf("%d", *p);
 	return 0;
-}
\ No newline at end of file
+}
+//no bug
+//output
+//3
\ No newline at end of file
diff --git a/8.cpp b/8.cpp
index 76b870c..1028969 100644
--- a/8.cpp
+++ b/8.cpp
@@ -11,3 +11,7 @@ int main() {
 
 	
 }
+//no bug
+//output
+//Be WooW
+