diff --git a/1.cpp b/1.cpp
index fedde2c..84d8580 100644
--- a/1.cpp
+++ b/1.cpp
@@ -4,7 +4,7 @@
 
 using namespace std;
 
-long long *b;
+long long int *b;// :|
 
 long long int factorial(int n)
 {
@@ -13,20 +13,20 @@ long long int factorial(int n)
 
 long long int *producingTheFactorialFractions()
 {
-    long long b[10];
+    long long int* b = new long long int[10];//assigning memory.
 
-	for (int i = 10; i >= 0; i--)
+	for (int i = 9; i >= 0; i--)//changing i.
 	{
-		b[i] += (int)pow(factorial(10), 2.0) / (i + 1);
+		b[i] = (long long int)pow(factorial(10), 2.0) / (i + 1);//changing int to long long int.
 	}
 	return b;
 }
 
-void checkZeros(long long *a)
+void checkZeros(long long int* a)//changing long long to long long int.
 {
 	for (int i = 9; i >= 0; i--)
 	{
-		if (a[i] = 0)
+		if (a[i] == 0)//changing = to ==. 
 			cout << "Zero Found" << endl;
 	}
 }
@@ -34,7 +34,7 @@ void checkZeros(long long *a)
 int main()
 {
 
-	long long int *a;
+	long long int *a = new long long int[10];//new assigning memory.
 	a = producingTheFactorialFractions();
 	checkZeros(a);
 	for (int i = 0; i < 10; i++)
@@ -43,8 +43,8 @@ int main()
 	}
 	delete a;
 
-	cout<<"hello";
+	cout<<"hello" << endl;
 	cout<<"Bye";
 
 
-}
\ No newline at end of file
+}
diff --git a/2.cpp b/2.cpp
index 6a27746..71c73e9 100644
--- a/2.cpp
+++ b/2.cpp
@@ -6,10 +6,10 @@ 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)
-        for (int j = 0; j <= sArr[i].size(); ++j)
+    for (int i = 0; i < arrLength; ++i)// chabging <= to <.
+        for (int j = 0; j < sArr[i].size(); ++j)//changing <= to <.
             // if the jth char of the string is the specific char
-            if (sArr[i][j] = specificChar)
+            if (sArr[i][j] == specificChar)//changing = to ==.
                 count++;
     return count;
 }
@@ -24,4 +24,4 @@ int main() {
     char findIt;
     cin >> findIt;
     cout << countAllSpecificChars(sArr, 4, findIt);
-}
\ No newline at end of file
+}
diff --git a/3.cpp b/3.cpp
index 77eb722..9a8be0e 100644
--- a/3.cpp
+++ b/3.cpp
@@ -1,6 +1,8 @@
 #include<stdio.h>
 #include<stdlib.h>
 #define MAX_SIZE 200
+using namespace std;
+
 int arr[MAX_SIZE];
 
 typedef struct alfa * alfaptr;
@@ -15,9 +17,16 @@ void push(int x)
 	alfaptr node;
 	node = (alfaptr)malloc(sizeof(struct alfa));
 	node->x = x;
+	node->next = NULL;//added.
+
 	if (!front)
+	{	
 		front = node;
-	else {
+		rear = node;//added.
+	}
+
+	else 
+	{
 		rear->next = node;
 		rear = node;
 	}
@@ -27,7 +36,7 @@ void pop()
 {
 	alfaptr node;
 	if (!front)
-		printf("ERROR1");
+		printf("ERROR1\n");
 	else
 	{
 		node = front->next;
@@ -39,21 +48,30 @@ void search(int x)
 	alfaptr node = front;
 	int counter = 0;
 	while (node)
+	{
 		if (node->x == x)
+		{
+			counter++;
 			printf("%d", counter);
-		else {
-			printf("ERROR2");
 			break;
 		}
+		counter++;
 		node = node->next;
+	}
+	if(counter == 0)
+	{
+		printf("ERROR@\n");
+	}
 }
 
+
 void rpop() {//pop last element
 	alfaptr node = front;
-	while (node)
+	while (node->next->next)
 		node = node->next;
 	free(rear);
 	rear = node;
+	rear->next->next =NULL;
 }
 
 void set()
@@ -68,13 +86,16 @@ int size()
 	alfaptr node = front;
 	int count;
 	while (node)
-		count++;node = node->next;
+	{
+		count++;
+		node = node->next;//added.
+	}
 	return count;
 }
 
 void show()
 {
-	if (!front) {
+	if (front) {//removing !.
 		for (int i = 0; i < MAX_SIZE; i++)
 			printf("%d ", arr[i]);
 	}
@@ -97,7 +118,7 @@ int average()
 	return sum / count;
 }
 
-void main()
+int main()
 {
 	int cmd;
 	long long int x;
@@ -133,4 +154,4 @@ void main()
 			exit(0);
 		}
 	}
-}
\ No newline at end of file
+}
diff --git a/4.cpp b/4.cpp
index a9a32f2..879c04c 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
+    //the program prints value of arr[3]-arr[0].(=78.0)
+}
diff --git a/5.cpp b/5.cpp
index 1be3d10..b2e7055 100644
--- a/5.cpp
+++ b/5.cpp
@@ -7,4 +7,5 @@ int main()
     printf("%d\n", (*ptr2 - *ptr1));
     printf("%c", (char)(*ptr2 - *ptr1));
     return 0;
-}
\ No newline at end of file
+    //the program prints value of arr[5]-arr[0](=50) and convert previous result to char. 
+}
diff --git a/6.cpp b/6.cpp
index f8b3141..8f734a8 100644
--- a/6.cpp
+++ b/6.cpp
@@ -7,5 +7,5 @@ int main()
 	a = 512;
 	x[0] = 1;
 	printf("%d\n", a);
-	return 0;
+	return 0;//the program prints 513.
 }
diff --git a/7.cpp b/7.cpp
index 7b065a0..170cf16 100644
--- a/7.cpp
+++ b/7.cpp
@@ -7,4 +7,5 @@ int main()
 	p += 2;
 	printf("%d", *p);
 	return 0;
-}
\ No newline at end of file
+	//the program prints 3.
+}
diff --git a/8.cpp b/8.cpp
index ac3d613..56ce9c3 100644
--- a/8.cpp
+++ b/8.cpp
@@ -7,7 +7,7 @@ int main() {
 	const char * str[] = { "Wish","You","Best",":D" };
 	printf("%c%c ", *f(str), *(f(str) + 1));
 	printf("%c%c%c%c\n", **str, *(*(str + 1) + 1), *((str + 2)[-1] + 1), **&*(&str[-1] + 1));
-
+	//the program prints 'Be' first and then prints 'WooW'.
 
 	
 }