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7.8

Heap program CRASHES

Asked by mikeregas in C Programming Language

my program is crashing at line 180. I am going to attach the sample.txt file and the assignment to avoid any confusion to what the program is suppose to do.

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             #include <stdio.h>
#include <stdlib.h>
 
struct tasks
{
	int priority;
	char command[24];
};
struct heap
{
    struct tasks* store;
    int size; // Number of values in the heap
    int capacity; // Maximum number of values before we
                  // expand the heap
};
 
struct heap* heapify(int array[], int num_elements);
 
struct heap *new_heap(int initial_capacity);
void percolate_down(struct heap* h, int position);
void percolate_up(struct heap* h, int position);
void expand_heap(struct heap* h);
void deletemax(struct heap* h);
void insert(struct heap* h, int value);
 
struct heap *new_heap(int initial_capacity)//new data is stored
{
    struct heap *h;
    
    h = malloc(sizeof(struct heap));
    h->store = calloc(initial_capacity, sizeof(struct tasks));
    h->size = 0;
    h->capacity = initial_capacity;
    
    return h;
}
 
 
void percolate_down(struct heap* h, int position)
{
    int temp;
    if(position * 2 > h->size)
        return;
        
    if(position * 2 == h->size)
    {
		if(h->store[position*2].priority <= h->store[position].priority)
            return;
        else
        {
            temp = h->store[position].priority;   
            h->store[position].priority = h->store[position*2].priority;
            h->store[position*2].priority = temp;
            return;
        }
    }
    
    if(h->store[position*2].priority <= h->store[position].priority 
            && h->store[position*2 + 1].priority <= h->store[position].priority)
        return;
    
    // Percolate to the left
    if(h->store[position*2].priority >= h->store[position*2 + 1].priority)
    {
        temp = h->store[position].priority;
        h->store[position].priority = h->store[position*2].priority;
        h->store[position*2].priority = temp;
        percolate_down(h, position * 2);
        return;
    }
    
    // Percolate to the right
    temp = h->store[position].priority;
    h->store[position].priority = h->store[position*2 + 1].priority;
    h->store[position*2 + 1].priority = temp;
    percolate_down(h, position * 2 + 1);
 
}
 
void percolate_up(struct heap* h, int position)
{
    int temp;
    
    if(position == 1)
        return;
    if(h->store[position/2].priority >= h->store[position].priority)
        return; 
    
    temp = h->store[position].priority;
    h->store[position].priority = h->store[position/2].priority;
    h->store[position/2].priority = temp;
    
    percolate_up(h, position/2);
}
 
void expand_heap(struct heap* h)
{
    struct tasks* newstore;
    int i;
    
    newstore = calloc(h->capacity * 2, sizeof(struct tasks));
    
    for(i = 1; i <= h->size; i++)
    {
		newstore[i] = h->store[i];   
    }
    free(h->store);
    h->store = newstore;
    h->capacity *= 2;
}
 
struct heap* heapify(int array[], int num_elements)// sorts data
{
    struct heap* h;
    int i;
    
    h = new_heap((num_elements + 1) * 2);
    
    for(i = 0; i < num_elements; i++)
    {
        h->store[i+1].priority = array[i];   
    }
    h->size = num_elements;
    
    for(i = h->size / 2; i >= 1; i--)
        percolate_down(h, i);
        
    return h;
}
 
void deletemax(struct heap* h)
{
	printf("Program %s with priority %d has been executed.\n", h->store[1].command, h->store[1].priority);
 
	strcpy(h->store[1].command, h->store[h->size].command);
	h->store[1].priority = h->store[h->size].priority;
    h->size--;
    
    percolate_down(h, 1);
}
 
void insert(struct heap* h, int value)
{
	printf("Program %s with priority %d has arrived.\n", h->store->command, h->store->priority);
 
	h->size++;
    if(h->size >= h->capacity)
        expand_heap(h);
    
	h->store[h->size].priority = value;
    percolate_up(h, h->size);
}
 
int main(void)
{
	FILE *ifp;
	char infile[48];
	char command[24];
	int valid = 0, priority;
	int i=0;
	int n = 0;
	char action;
	struct tasks p;
	struct heap *h;
	(h)=new_heap(48);
 
	
	while(!valid)
	{
		printf("What is the name of the input file?\n");
		scanf("%s", infile);
		ifp = fopen(infile, "r");
 
		if(ifp == NULL)
			printf("File not found!\n");
		else
		{
			valid = 1;
			printf("*******_______-------*******\n");//locate crash
			for(i = 0; i < n; i++)
			{
				fscanf(ifp, "%s", action);
				if(strcmp(action, "new")==0)
				{
					fscanf(ifp, "%d %s", p.priority, p.command);
					printf("Program %s with priority %d has arrived.\n", p.command, p.priority);
 
				}
				else if(strcmp(action, "execute")==0)
				{
					if (h->size==0)
						printf("Heap is empty, no programs executed!\n");
					else 
					{
						deletemax(&h);
					}
				}
				
			}
		
		}
	}
	valid = 0;
	fclose(ifp);
 
	system("PAUSE");
	return 0;
}

           
         

Attachments:

sample.txt (139 bytes) (File Type Details)

sample text file to read for the program

Assignment5.doc (28 KB) (File Type Details)

programming assignment, for clarification on what this is suppose to do

20091111-EE-VQP-89 - Hierarchy / EE_QW_2_20070628

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Heap program CRASHES

Asked by mikeregas in C Programming Language

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