Using unix command line to sort random array

hey everyone I need to use the command line arguments -a and -d to sort a random array in ascending and descending order (respectively). I have the random number generator down but I have no idea how to implement the argc argv[] part into the program so if i run my program in a unix shell like Program -a would output array in ascending order where Program -d would output array in descending order. Here is what I have so far....

Code:

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

int main(int argc, const char * argv[])
{
        int array[20];
        int i;

        for (i=0; i<20; i++)
                array[i] = i;

        srand( (unsigned)time( NULL ) );
        for (i=0; i<20; i++)
        {
                array[i]= rand()%1000;

				
}
        for (i=0; i<20; i++)
                printf("array[%d] = %d\n",i,array[i]);

        return(0);
}

There's something about handling command line arguments in the FAQ.

ok i got a little farther, will somebody please help me out, it would be greatly appreciated.

Code:

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


void swap(void *e1, void *e2, size_t size);
void bubblesort(void *base, size_t n, size_t size,
int (*cmp)(const void *el1, const void *el2));

		int array[20];
		int i,n,c=0;
		

int main(int argc, char * argv[])
{
        int array[20];
        int i;
		
		  for (i=0; i<20; i++)
                array[i] = i;

        srand( (unsigned)time( NULL ) );
        for (i=0; i<20; i++)
        {
                array[i]= rand()%1000;

				
}
        for (i = 1; i < argc; i++)
  {
    if (argv[i][0] == '-')
      if (argv[i][1] == 'a'){
          
				void bubblesort();
				for( i=0; i<20; i++)
				printf("%d\n",array[i]);
					}
      else if (argv[i][1] == 'd')
        {
  			void bubblesort();
			for( i=0; i<20; i++)
			printf("%d\n",array[i]);
		}      else printf ("Unknown switch %s\n", argv[i])
    else if (strcmp(argv[i], "name") == 0)
      puts ("Found name");
  }

		
			

        return(0);
}

void bubblesort(void *base, size_t n, size_t size,
int (*cmp)(const void *el1, const void *el2))
{
size_t i, sorted = 0;
char *p = (char *) base;

while(!sorted)
{
sorted = 1;
for(i = 0;i < n-1; i++)
{
if(cmp(p+(i*size),p+((i+1)*size))>0)
{
swap(p+(i*size),p+((i+1)*size),size);
sorted = 0;
}
}
}
}

void swap(void *e1, void *e2, size_t size)
{
char buf[256], *p1 = (char *)e1, *p2 = (char *)e2;
size_t ms;

for(ms = size; 0< ms; )
{
size_t m = ms < sizeof(buf)?ms:sizeof(buf);
memcpy(buf,p1,m);
memcpy(p1,p2,m);
memcpy(p2,buf,m);
ms -= m, p1+=m, p2+=m;
}
return;
}

int cmp(const void *e1, const void *e2)
{
int *i1 = *(int **)e1, *i2 = *(int **)e2;

return (*i1<*i2)?-1:(*i1!=*i2);
}

ok i changed the sort functions to a different type, why isnt this working?

Code:

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


void bubbleDescend(int*,int);
void printElements(int*, int);
void bubbleAscend(int*, int);
void printAscend(int*, int);

		int integers[20];
		int i,k,n,c=0;
		

int main(int argc, char * argv[])
{
		
		  for (i=0; i<20; i++)
                integers[i] = i;

        srand( (unsigned)time( NULL ) );
        for (i=0; i<20; i++)
        {
                integers[i]= rand()%1000;

				
}
        for (i = 1; i < argc; i++)
  {
    if (argv[i][0] == '-')
      if (argv[i][1] == 'a'){
          
				bubbleDescend(integers,n);
				printElements(integers,n);
					}
      else if (argv[i][1] == 'd')
        {
  			bubbleAscend(integers,n);
			printAscend(integers, n);
			}
			else printf ("Unknown switch %s\n", argv[i]);
    else if (strcmp(argv[i], "name") == 0)
      puts ("Found name");
  }

		
			
return 0;
}
 
void bubbleDescend(int *p,int length)//Bubble sort function 
{
	int h,j;
	for(j=0;j<length;j++)
	{
		for(h=0;h>j;h++)
		{
			if(p[j]>p[h])
			{
				int temp=p[j]; //swap 
				p[j]=p[h];
				p[h]=temp;
			}
 
		}
 
	}
 
}
 
void bubbleAscend(int *q, int length)
{
	int m,t;
	for(m=0;m<length;m++)
	{
		for(t=0;t<m;t++)
		{
			if(q[m]<q[t])
			{
				int temp=q[m]; //swap 
				q[m]=q[t];
				q[t]=temp;
			}
 
		}
 
	}
 
}
void printElements(int *p, int length) //print array elements
{
	int k=0;
	for(k=0;i<length;k++)
	{
		printf("%d\n", p[k]);
	}
}
void printAscend(int *q, int length) //print array elements
{
	int s=0;
	for(s=0;s<length;s++)
	{
		printf("%d\n",q[s]);
	}
}

seems this worked

Code:

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

 /* function prototypes */
void bubbleDescend(int *p,int length);
void printAscend(int *p,int length);
void bubbleAscend(int *p,int length);
void printAscend(int *p,int length);

	int integers[20]; /* define array */
			
int main(int argc, char * argv[]) /* set up main to take command line arguments */
{
		int i=0;
		  
        srand( (unsigned)time( NULL ) );  /* random seed generator */
        for (i=0; i<20; i++)
        {
                integers[i]= rand()%1000;	/* fill array slots 0-19 with random
														   integers 1-1000 */
			}
          
				
	for (i = 1; i < argc; i++)     
  {
    if (argv[i][0] == '-')				/* if commandline input is -a ... */
      if (argv[i][1] == 'a'){
			printf("\n");
  			bubbleAscend(integers,21);
			printAscend(integers, 21);
			printf("\n");
			}		
      else if (argv[i][1] == 'd')		/* if command line input is =d */
        {
  			bubbleDescend(integers,21);
			printAscend(integers, 21);
			}
			else printf ("Unknown switch %s\n", argv[i]);
    else if (strcmp(argv[i], "name") == 0)
      puts ("Found name");
  }	
			printf("\n");
return 0;
}
 
void bubbleDescend(int *p,int length) /* Descending sort function */
{
	int h,j;
	for(j=0;j<length;j++)
	{
		for(h=0;h<j;h++)
		{
			if(p[j]>p[h])
			{
				int temp=p[j]; /*swap */
				p[j]=p[h];
				p[h]=temp;
			}
 
		}
 
	}
 
}
 
void bubbleAscend(int *q, int length) /* ascending sort function */
{
	int m,t;
	for(m=0;m<length;m++)
	{
		for(t=0;t<m;t++)
		{
			if(q[m]<q[t])
			{
				int temp=q[m]; /*swap */
				q[m]=q[t];
				q[t]=temp;
			}
 
		}
 
	}
 
}

void printAscend(int *q, int length) /*print array elements */
{
	int s=0;
	for(s=0;s<length;s++)
	{
		printf("%d\n",q[s]);
	}
}