Added C program to implement Stack using Structure and Array.

C Programming Language/Stack/Stack-using-Array.c

@@ -0,0 +1,66 @@
+// C program to implement Stack using array //
+// Written by: @ExpressHermes
+
+#include <stdio.h>
+#include <stdlib.h>
+#define SIZE 100
+
+int stack[SIZE];
+int top = -1;
+
+void push(int value) {
+    if(top == SIZE -1) 
+        printf("\nOverflow. Stack is full\n");
+    else {
+        top++;
+        stack[top] = value;
+        printf("\nInsertion was successful\n");
+    }
+}
+
+void pop() {
+    if(top == -1)
+        printf("\nUnderflow. Stack is empty\n");
+    else {
+        printf("\nPopped Value: %d\n", stack[top]);
+        top--;
+    }
+}
+
+void display() {
+    if(top == -1)
+        printf("\nStack is empty \n");
+    else {
+        printf("Stack elements are: ");
+        for(int i = top; i >= 0; i--)
+            printf("%d\t", stack[i]);
+        printf("\n");
+    }
+}
+
+int main(void) {
+	int choice, value;
+	printf("\n************* STACK IMPLEMENTATION USING STRUCURES *************\n");
+
+	while(1) {
+    	printf("1. Push\n2. Pop\n3. Display\n4. Exit\n");
+    	printf("Enter your choice: ");
+    	scanf("%d",&choice);
+
+    	switch(choice) {
+    	    case 1: printf("Enter value to be pushed: ");
+    	            scanf("%d", &value);
+    	            push(value);
+    	            break;
+    	    case 2: pop();
+    	            break;
+    	    case 3: display();
+    	            break;
+    	    case 4: exit(0);
+    	    default: printf("\nWrong choice. Try again.\n");
+    	}
+	}
+	return 0;
+}
+
+

C Programming Language/Stack/Stack-using-Structure.c

@@ -0,0 +1,79 @@
+// C program to implement Stack using structure //
+// Written by: @ExpressHermes
+
+#include <stdio.h>
+#include <stdlib.h>
+
+struct Node {
+    int data;
+    struct Node* next;
+};
+
+struct Node* top = NULL;
+
+void push(int value) {
+
+    struct Node *newNode;
+    newNode = (struct Node*)malloc(sizeof(struct Node));
+    newNode -> data = value;
+
+    if(top == NULL)
+        newNode -> next = NULL;
+    else 
+        newNode -> next = top;
+    top = newNode;
+
+    printf("\nInsertion was successful\n");
+}
+
+void pop() {
+    if(top == NULL)
+        printf("\nUnderflow. Stack is empty.\n");
+    else {
+        struct Node* temp = top;
+        printf("Popped Value:\t%d\n", temp -> data);
+        top = temp -> next;
+        free(temp);
+    }
+}
+
+void display() {
+    if(top == NULL)
+        printf("\nUnderflow. Stack is empty.\n");
+    else {
+        struct Node* temp = top;
+        printf("Stack elements are: ");
+        while(temp != NULL) {
+            printf("%d\t", temp -> data);
+            temp = temp -> next;
+        }
+        printf("\n");
+    }
+}
+
+int main(void) {
+	int choice, value;
+	printf("\n************* STACK IMPLEMENTATION USING STRUCURES *************\n");
+
+	while(1) {
+    	printf("1. Push\n2. Pop\n3. Display\n4. Exit\n");
+    	printf("Enter your choice: ");
+    	scanf("%d",&choice);
+
+    	switch(choice) {
+    	    case 1: printf("Enter value to be pushed: ");
+    	            scanf("%d", &value);
+    	            push(value);
+    	            break;
+    	    case 2: pop();
+    	            break;
+    	    case 3: display();
+    	            break;
+    	    case 4: exit(0);
+    	    default: printf("\nWrong choice. Try again.\n");
+    	}
+	}
+	return 0;
+}
+
+