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stacks in c

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Unusual Unicorn answered on January 22, 2022 Popularity 10/10 Helpfulness 3/10

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stacks in c

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// C program for array implementation of stack
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
 
// A structure to represent a stack
struct Stack {
    int top;
    unsigned capacity;
    int* array;
};
 
// function to create a stack of given capacity. It initializes size of
// stack as 0
struct Stack* createStack(unsigned capacity)
{
    struct Stack* stack = (struct Stack*)malloc(sizeof(struct Stack));
    stack->capacity = capacity;
    stack->top = -1;
    stack->array = (int*)malloc(stack->capacity * sizeof(int));
    return stack;
}
 
// Stack is full when top is equal to the last index
int isFull(struct Stack* stack)
{
    return stack->top == stack->capacity - 1;
}
 
// Stack is empty when top is equal to -1
int isEmpty(struct Stack* stack)
{
    return stack->top == -1;
}
 
// Function to add an item to stack.  It increases top by 1
void push(struct Stack* stack, int item)
{
    if (isFull(stack))
        return;
    stack->array[++stack->top] = item;
    printf("%d pushed to stack\n", item);
}
 
// Function to remove an item from stack.  It decreases top by 1
int pop(struct Stack* stack)
{
    if (isEmpty(stack))
        return INT_MIN;
    return stack->array[stack->top--];
}
 
// Function to return the top from stack without removing it
int peek(struct Stack* stack)
{
    if (isEmpty(stack))
        return INT_MIN;
    return stack->array[stack->top];
}
 
// Driver program to test above functions
int main()
{
    struct Stack* stack = createStack(100);
 
    push(stack, 10);
    push(stack, 20);
    push(stack, 30);
 
    printf("%d popped from stack\n", pop(stack));
 
    return 0;
}

Popularity 10/10 Helpfulness 3/10 Language whatever

Source: www.geeksforgeeks.org

Tags: c whatever

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Contributed on Jan 22 2022

Unusual Unicorn

0 Answers Avg Quality 2/10

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stacks in c

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// C program for linked list implementation of stack
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
 
// A structure to represent a stack
struct StackNode {
    int data;
    struct StackNode* next;
};
 
struct StackNode* newNode(int data)
{
    struct StackNode* stackNode =
      (struct StackNode*)
      malloc(sizeof(struct StackNode));
    stackNode->data = data;
    stackNode->next = NULL;
    return stackNode;
}
 
int isEmpty(struct StackNode* root)
{
    return !root;
}
 
void push(struct StackNode** root, int data)
{
    struct StackNode* stackNode = newNode(data);
    stackNode->next = *root;
    *root = stackNode;
    printf("%d pushed to stack\n", data);
}
 
int pop(struct StackNode** root)
{
    if (isEmpty(*root))
        return INT_MIN;
    struct StackNode* temp = *root;
    *root = (*root)->next;
    int popped = temp->data;
    free(temp);
 
    return popped;
}
 
int peek(struct StackNode* root)
{
    if (isEmpty(root))
        return INT_MIN;
    return root->data;
}
 
int main()
{
    struct StackNode* root = NULL;
 
    push(&root, 10);
    push(&root, 20);
    push(&root, 30);
 
    printf("%d popped from stack\n", pop(&root));
 
    printf("Top element is %d\n", peek(root));
 
    return 0;
}

Popularity 10/10 Helpfulness 3/10 Language c

Source: www.geeksforgeeks.org

Tags: c

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Contributed on Jan 22 2022

Unusual Unicorn

0 Answers Avg Quality 2/10

stack in c

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#include <stdio.h>
#include <malloc.h>
#include "ADTStack.h"

struct Stack_t {
void** array;
int top;
int maxCapacity;
void* (*cp_elm)(void*);
void (*fr_elm)(void*);
char* (*lbl_elm)(void*);
};

Stack init(int max_size, void* (*cpy_elm)(void*), void (*free_elm)(void*), char* (*label_elm)(void*)) {
	Stack ps;
	if ((max_size<=0)||(!cpy_elm)||(!free_elm)||(!label_elm)) {
		fprintf(stderr,"Fatal error\n");
                return NULL; 
        }        
	ps = (Stack)malloc(sizeof(struct Stack_t));
	if (!ps) {
		fprintf(stderr,"Fatal error\n");
		return NULL;
	}	
	ps->array = malloc(max_size*sizeof(void*));
	if (!(ps->array)) {
		free(ps);
		fprintf(stderr,"Fatal error\n");
		return NULL;
	}
	ps->top = 0;
	ps->maxCapacity = max_size;
	ps->cp_elm = cpy_elm;
	ps->fr_elm = free_elm;
	ps->lbl_elm = label_elm;
	return ps;
}

int push (Stack s, void* elm) {
	if((!s)||(s->top==s->maxCapacity)) {
		fprintf(stderr,"Fatal error\n");
		return 0;
	}
	s->array[s->top] = s->cp_elm(elm);
	s->top++;
	return 1;
}

void* pop (Stack s) {
	if ((!s)||(s->top==0)) {
		fprintf(stderr,"Fatal error\n");
		return NULL;
	}
	s->top--;
	return s->array[s->top]; 
}

void clear (Stack s) {
	if (!s) {
		fprintf(stderr,"Fatal error\n");
                return;
        } 
	while (s->top > 0)
		s->fr_elm(s->array[--s->top]);
}

int size(Stack s) {
	if (!s) {
                fprintf(stderr,"Fatal error\n");
                return -1;
        }
	return s->top;
}

void print(Stack s) {
	int cur;
	char* label = NULL;
	if (!s) {
                fprintf(stderr,"Fatal error\n");
                return;
        } 
	cur = s->top;
	while (cur > 0) {
		label = s->lbl_elm(s->array[--cur]);
		if (!label) {
			fprintf(stderr,"Fatal error\n");
			return;
		} else {
			printf("%s\n",label);
			free(label);
		}
	}
}

void destroy (Stack s) {
	if (!s) {
                fprintf(stderr,"Fatal error\n");
                return;
        } 
	clear(s);
	free(s->array);
	free(s);
}

Popularity 10/10 Helpfulness 2/10 Language c

Source: Grepper

Tags: c

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Contributed on Oct 31 2022

Mero

0 Answers Avg Quality 2/10

stack in c

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#ifndef _ADTSTACK_H
#define _ADTSTACK_H

typedef struct Stack_t* Stack;

/* initializes the Stack; sets the maximal capacity to max_size
   returns a pointer to a record on the HEAP
 */
Stack init(int max_size, void* (*cpy_elm)(void*), void (*free_elm)(void*), char* (*label_elm)(void*));

/* inserts a copy of the element to the top of the stack. 
returns a non-zero value upon success, zero on fail.
fails if init was not called prior to that, or if the stack is full. */
int push (Stack s, void* elm);

/* removes the element at the top of the stack and returns it.
fails either if init was not called prior to that, or if the stack is empty */
void* pop (Stack s);

/* removes all elements from the stack; all elements are freed.
fails if init was not called prior to that */
void clear (Stack s);

/* returns the number of elements in the stack, or a negative value when fails.
fails either if init was not called prior to that, or if the stack is empty */
int size(Stack s);

/* prints the contents of the stack.
fails if init was not called prior to that */
void print(Stack s);

/* releases all the resources of the stack */
void destroy (Stack s);

#endif

Popularity 10/10 Helpfulness 2/10 Language c

Source: Grepper

Tags: c

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Contributed on Oct 31 2022

Mero

0 Answers Avg Quality 2/10

create a stack in c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int Square(int x)

{
   return x*x;
}
int SquareOfSum(int a, int b){
    int c= Square(a+b);
    return c;

}

int main(){

    int total;
    int d= 5, e = 6; 
    total = SquareOfSum(d,e); 
    printf("output =%d ", total);


    return 0;


}

Popularity 1/10 Helpfulness 1/10 Language c

Source: Grepper

Tags: c stack

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Contributed on Mar 11 2022

Haya Saeed

0 Answers Avg Quality 2/10

stacks in c

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