Compute avreage on a stack

average_in_stack.c

// ConsoleApplication22.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include "pch.h"
#include <iostream>



struct Stack
{
	int top;
	unsigned capacity;
	int* array;
};


/*
	Create a stack. Size is 0
*/
Stack* createStack(unsigned capacity)
{
	Stack* stack = (struct Stack*) malloc(sizeof(struct Stack));
	if (stack == NULL)
	{
		printf("stack null");
		exit(-1);
	}
	stack->capacity = capacity;
	stack->top = -1;
	stack->array = (int*)malloc(stack->capacity * sizeof(int));
	if (stack->array == NULL)
	{
		printf("couldn't allocate memory !");
		exit(-1);
	}
	
}

//top = last_index
int isFull(Stack* stack)
{
	return stack->top == stack->capacity - 1;
}

//top = -1
int isEmpty(Stack* stack)
{
	return stack->top == -1;
}

void push(Stack* stack, int item)
{
	if (isFull(stack))
		return;

	stack->array[++stack->top] = item;
	printf("%d pushed to stack\n", item);
}

int pop(Stack* stack)
{
	if (isEmpty(stack))
		return -1;

	return stack->array[stack->top--];
}

int peek(Stack* stack)
{
	return stack->top;
}

int main()
{
	Stack* stack = createStack(10);
	int sum = 0;
	push(stack, 30);
	push(stack, 30);
	push(stack, 30);
	printf("Dim stiva: %d", sizeof(stack));
	for (size_t i = 1; i < sizeof(stack); i++)
	{
		sum += pop(stack);
	}
	float average = 0.0;
	average = (float)sum / (sizeof(stack) - 1);
	printf("Avg is - %f", average);
	free(stack);
	
	return 0;
}