diff --git a/C/Program-71 b/C/Program-71
new file mode 100644
index 00000000..2adf2599
--- /dev/null
+++ b/C/Program-71
@@ -0,0 +1,121 @@
+#include <stdio.h>  
+#include <stdlib.h>  
+void push();  
+void pop();  
+void display();  
+struct node   
+{  
+int val;  
+struct node *next;  
+};  
+struct node *head;  
+  
+void main ()  
+{  
+    int choice=0;     
+    printf("\n*********Stack operations using linked list*********\n");  
+    printf("\n----------------------------------------------\n");  
+    while(choice != 4)  
+    {  
+        printf("\n\nChose one from the below options...\n");  
+        printf("\n1.Push\n2.Pop\n3.Show\n4.Exit");  
+        printf("\n Enter your choice \n");        
+        scanf("%d",&choice);  
+        switch(choice)  
+        {  
+            case 1:  
+            {   
+                push();  
+                break;  
+            }  
+            case 2:  
+            {  
+                pop();  
+                break;  
+            }  
+            case 3:  
+            {  
+                display();  
+                break;  
+            }  
+            case 4:   
+            {  
+                printf("Exiting....");  
+                break;   
+            }  
+            default:  
+            {  
+                printf("Please Enter valid choice ");  
+            }   
+    };  
+}  
+}
+//adding a node  
+void push ()  
+{  
+    int val;  
+    struct node *ptr = (struct node*)malloc(sizeof(struct node));   
+    if(ptr == NULL)  
+    {  
+        printf("not able to push the element");   
+    }  
+    else   
+    {  
+        printf("Enter the value");  
+        scanf("%d",&val);  
+        if(head==NULL)  
+        {         
+            ptr->val = val;  
+            ptr -> next = NULL;  
+            head=ptr;  
+        }   
+        else   
+        {  
+            ptr->val = val;  
+            ptr->next = head;  
+            head=ptr;  
+               
+        }  
+        printf("Item pushed");  
+          
+    }  
+}  
+// deleting a node  
+void pop()  
+{  
+    int item;  
+    struct node *ptr;  
+    if (head == NULL)  
+    {  
+        printf("Underflow");  
+    }  
+    else  
+    {  
+        item = head->val;  
+        ptr = head;  
+        head = head->next;  
+        free(ptr);  
+        printf("Item popped");  
+          
+    }  
+} 
+//display node transversal 
+void display()  
+{  
+    int i;  
+    struct node *ptr;  
+    ptr=head;  
+    if(ptr == NULL)  
+    {  
+        printf("Stack is empty\n");  
+    }  
+    else  
+    {  
+        printf("Printing Stack elements \n");  
+        while(ptr!=NULL)  
+        {  
+            printf("%d\n",ptr->val);  
+            ptr = ptr->next;  
+        }  
+    }  
+}  
diff --git a/C/Program-72 b/C/Program-72
new file mode 100644
index 00000000..58a9ca9f
--- /dev/null
+++ b/C/Program-72
@@ -0,0 +1,64 @@
+#include<stdio.h>
+#include<conio.h>
+
+#define SIZE 10
+
+void push(int);
+void pop();
+void display();
+
+int stack[SIZE], top = -1;
+
+void main()
+{
+   int value, choice;
+   clrscr();
+   while(1){
+      printf("\n\n***** MENU *****\n");
+      printf("1. Push\n2. Pop\n3. Display\n4. Exit");
+      printf("\nEnter your choice: ");
+      scanf("%d",&choice);
+      switch(choice){
+	 case 1: printf("Enter the value to be insert: ");
+		 scanf("%d",&value);
+		 push(value);
+		 break;
+	 case 2: pop();
+		 break;
+	 case 3: display();
+		 break;
+	 case 4: exit(0);
+	 default: printf("\nWrong selection!!! Try again!!!");
+      }
+   }
+}
+//adding a top stack using array index
+void push(int value){
+   if(top == SIZE-1)
+      printf("\nStack is Full!!! Insertion is not possible!!!");
+   else{
+      top++;
+      stack[top] = value;
+      printf("\nInsertion success!!!");
+   }
+}
+//deleting a stack top usin array index
+void pop(){
+   if(top == -1)
+      printf("\nStack is Empty!!! Deletion is not possible!!!");
+   else{
+      printf("\nDeleted : %d", stack[top]);
+      top--;
+   }
+}
+//display stack transversal using array index iteration
+void display(){
+   if(top == -1)
+      printf("\nStack is Empty!!!");
+   else{
+      int i;
+      printf("\nStack elements are:\n");
+      for(i=top; i>=0; i--)
+	 printf("%d\n",stack[i]);
+   }
+}
diff --git a/C/README.md b/C/README.md
index e484fb77..718a4f7d 100644
--- a/C/README.md
+++ b/C/README.md
@@ -73,3 +73,7 @@
 | Program-69 | Program to find strong number |
 | Program-70 | Program to make a simple calculator |
 | Program-71 | Program to implement stack using array & linked list |
+| Program-72 | Program to implement stack using linked list |
+| Program-73 | Program to implement stack using array |
+
+
diff --git a/Program-72 b/Program-72
new file mode 100644
index 00000000..6c075b7c
--- /dev/null
+++ b/Program-72
@@ -0,0 +1,65 @@
+#include<stdio.h>
+#include<conio.h>
+
+#define SIZE 10
+
+void push(int);
+void pop();
+void display();
+
+int stack[SIZE], top = -1;
+
+void main()
+{
+   int value, choice;
+   clrscr();
+   while(1){
+      printf("\n\n***** MENU *****\n");
+      printf("1. Push\n2. Pop\n3. Display\n4. Exit");
+      printf("\nEnter your choice: ");
+      scanf("%d",&choice);
+      switch(choice){
+	 case 1: printf("Enter the value to be insert: ");
+		 scanf("%d",&value);
+		 push(value);
+		 break;
+	 case 2: pop();
+		 break;
+	 case 3: display();
+		 break;
+	 case 4: exit(0);
+	 default: printf("\nWrong selection!!! Try again!!!");
+      }
+   }
+}
+//adding a top stack using array index
+void push(int value){
+   if(top == SIZE-1)
+      printf("\nStack is Full!!! Insertion is not possible!!!");
+   else{
+      top++;
+      stack[top] = value;
+      printf("\nInsertion success!!!");
+   }
+}
+//deleting a stack top usin array index
+void pop(){
+   if(top == -1)
+      printf("\nStack is Empty!!! Deletion is not possible!!!");
+   else{
+      printf("\nDeleted : %d", stack[top]);
+      top--;
+   }
+}
+//display stack transversal using array index iteration
+void display(){
+   if(top == -1)
+      printf("\nStack is Empty!!!");
+   else{
+      int i;
+      printf("\nStack elements are:\n");
+      for(i=top; i>=0; i--)
+	 printf("%d\n",stack[i]);
+   }
+}
+