Added Stack Program using arrays.

Author: king04aman

Stack/StackUsingArrays.c

@@ -0,0 +1,142 @@
+/*
+Program : Stack implementation using array in C.
+Author : Aman Kumar
+*/
+
+#include<stdio.h>
+#include<stdlib.h>
+#define SIZE 5
+
+//Global Variables 
+int top = -1;
+int arr[SIZE],i;
+
+// Pushing element into the stack.
+void push(int item)
+{
+    if(top >= (SIZE - 1))
+    {
+        printf("Stack is overflow.\n");
+    }
+    else{
+        top++;
+        arr[top] = item;
+        printf("Pushed %d in stack at %dth position.\n",item,top);
+    }
+}
+
+//Popping element from stack.
+void pop()
+{
+    if(top < 0)
+    {
+        printf("Stack is underflow. \n");
+    }
+    else{
+        printf("Popped %d from the stack.\n",arr[top]);
+        arr[top] = NULL;
+        top--;
+    }
+}
+
+//Peeking element of stack.
+void peek()
+{
+    printf("Peeking top element.\n Top element is : %d\n",arr[top]);
+}
+
+// Find element in stack
+void search(int item)
+{
+    int flag = 0;
+    for(i=0;i<SIZE;i++)
+    {
+        if(arr[i] == item)
+        {
+            flag = 1;
+            break;
+        }
+    }
+    (flag == 1)?printf("Element(%d) found at %dth position in stack.\n",item,i+1):printf("Did not find element (%d) in the stack.\n",item);
+}
+
+//Finding minimum element of stack.
+void min()
+{
+    int x = arr[0];
+    for(i=0;i<SIZE;i++)
+    {
+        if(x > arr[i])
+            x = arr[i];
+    }
+    printf("Minimum element in stack is : \t%d\n",x);
+}
+
+//Finding maximum element of stack.
+void max()
+{
+    int x = arr[0];
+    for(i=0;i<SIZE;i++)
+    {
+        if(x < arr[i])
+            x = arr[i];
+    }
+    printf("Maximum element in stack is : \t%d\n",x);
+}
+
+//Displaying elements of stack.
+void display()
+{
+    int i;
+    for(i=0;i<SIZE;i++)
+        printf("%d\n",arr[i]);
+}
+
+
+//Main function as user for operations input.
+int main()
+{
+    int ch,x;
+    while (1)
+    {
+        printf("Please select an option: \n 1. Push \t\t\t 2. Pop \n 3. Peek \t\t\t 4. Search \n 5. Minimum \t\t\t 6. Maximum \n 7. Display \t\t\t 8. Exit\n\n");
+        scanf("%d",&ch);
+
+        switch(ch)
+        {
+        case 1:
+            printf("Please enter the element which you want to push into the stack: \n");
+            scanf("%d",&x);
+            push(x);
+            break;
+        case 2:
+            pop();
+            break;
+        case 3:
+            peek();
+            break;
+        case 4:
+            printf("Please enter the element which you want to search into the stack: \n");
+            scanf("%d",&x);
+            search(x);
+            break;
+        case 5:
+            min();
+            break;
+        case 6:
+            max();
+            break;
+        case 7:
+            display();
+            break;
+        case 8:
+            exit(0);
+            break;
+        default:
+            printf("Invalid option requested.\nPlease retry.\n");
+            break;
+        }
+
+    }
+    return 0;
+}