Implement a stack as an array of int[100] and an int variable top top is initialized to -1 (which means the stack is empty) Define three int functions: push (), pop(), and isEmpty() push(int v): if top>=99 print error message and return 0, otherwise increment top, put v into stack[top], return 0 pop(): if top<0 print error message and return 0, otherwise return stack[top] and decrement top isEmpty(): if top<0 then return 0, otherwise return 1 To test your program, run the following sequence of function calls, printing the values of the рops: pop (); push(1); push(2); push(3); pop(); push (4); push(5); pop(); pop(); push(6); pop(); pop();

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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How do I code the following stack in C program? 

 

### Implementing a Stack in C

Stacks are a fundamental data structure used in various applications in computer science. In this example, we will demonstrate how to implement a stack using an array in the C programming language. 

A stack operates on a Last-In-First-Out (LIFO) principle, where the most recently added item is the first one to be removed. 

#### Step-by-Step Implementation

1. **Initialization:**
   - We will use an array of integers, `int[100]`, to store the stack elements.
   - An integer variable `top` will keep track of the index of the topmost element. It is initialized to `-1`, indicating that the stack is empty.

2. **Defining Functions:**
   - Three primary functions will be implemented: `push()`, `pop()`, and `isEmpty()`.

#### Function Definitions

1. **push(int v):**
   - This function adds an integer `v` to the top of the stack.
   - **Error Handling:** If the stack is full (i.e., `top >= 99`), it prints an error message and returns `0`.
   - Otherwise, it increments the `top`, adds `v` to `stack[top]`, and returns `0`.

2. **pop():**
   - This function removes and returns the topmost element from the stack.
   - **Error Handling:** If the stack is empty (i.e., `top < 0`), it prints an error message and returns `0`.
   - Otherwise, it returns the value of `stack[top]` and decrements the `top`.

3. **isEmpty():**
   - This function checks if the stack is empty.
   - It returns `0` if the stack is empty (`top < 0`) and `1` otherwise.

#### Implementation Code

```c
#include <stdio.h>

int stack[100];
int top = -1; // The stack is initially empty

int push(int v) {
    if (top >= 99) {
        printf("Error: Stack Overflow\n");
        return 0;
    } else {
        top++;
        stack[top] = v;
        return 0;
    }
}

int pop() {
    if (top < 0) {
        printf("Error: Stack Underflow\n");
        return 0;
    } else {
        return stack[top--];
    }
}

int
Transcribed Image Text:### Implementing a Stack in C Stacks are a fundamental data structure used in various applications in computer science. In this example, we will demonstrate how to implement a stack using an array in the C programming language. A stack operates on a Last-In-First-Out (LIFO) principle, where the most recently added item is the first one to be removed. #### Step-by-Step Implementation 1. **Initialization:** - We will use an array of integers, `int[100]`, to store the stack elements. - An integer variable `top` will keep track of the index of the topmost element. It is initialized to `-1`, indicating that the stack is empty. 2. **Defining Functions:** - Three primary functions will be implemented: `push()`, `pop()`, and `isEmpty()`. #### Function Definitions 1. **push(int v):** - This function adds an integer `v` to the top of the stack. - **Error Handling:** If the stack is full (i.e., `top >= 99`), it prints an error message and returns `0`. - Otherwise, it increments the `top`, adds `v` to `stack[top]`, and returns `0`. 2. **pop():** - This function removes and returns the topmost element from the stack. - **Error Handling:** If the stack is empty (i.e., `top < 0`), it prints an error message and returns `0`. - Otherwise, it returns the value of `stack[top]` and decrements the `top`. 3. **isEmpty():** - This function checks if the stack is empty. - It returns `0` if the stack is empty (`top < 0`) and `1` otherwise. #### Implementation Code ```c #include <stdio.h> int stack[100]; int top = -1; // The stack is initially empty int push(int v) { if (top >= 99) { printf("Error: Stack Overflow\n"); return 0; } else { top++; stack[top] = v; return 0; } } int pop() { if (top < 0) { printf("Error: Stack Underflow\n"); return 0; } else { return stack[top--]; } } int
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