Write a program that sorts an array of integers into ascending order or descendi

Question

Write a program that sorts an array of integers into ascending order or descending order. Use command-line arguments to pass either argument -a for ascending order or -d for descending order. [Note: This is the standard format for passing options to a program in UNIX.]

This is what I got:
#include
#include

int main(void){

int i,x;
int a[20];

srand(time(NULL));

for(i=1;i<=20;i++)
{
a[i] = 1 + rand()%1000;
printf("%d = %d ",i,a[i]);
}/* end for*/

}/* end main */


But, I don't get how to sort the array in ascending or descending order and how to use command-line argument. 

Explanation / Answer

To use command line arguments, the main function should take arguments argc and argv instead of void. int main ( int argv, char * argv[]) here argv represents the number of arguments passed and argv contains the arguments. suppose you execute the program as ./a.out -a then argv is 2. That is argv[0] = a.out and argv[1] = -a Sorting: There are various algorithms for sorting such as insertion sort, merge sort , quick sort etc. You can use one of those.. This is a code for insertion sort void sort(int a[],int n) { int i,j,key; for(i=2;i0&&key

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