#include <stdio.h>
#include <time.h>
#include <stdlib.h>
 
void printfAll(int size, int ary[]) 
{
	int a;
 
	for(a=0; a< size; a++)
	{
		if(!(a%10)) //why a%10 and what not equal to it//
			printf("\n");
		printf("%5d", ary[a]);
	}
	printf("\n");
}
 
 
void printOddIdx(int size, int ary[]) 
{
	int a;
	for(a=1; a<size; a+=2) 
	{
		if(!((a-1)%20)) 
			printf("\n");
		printf("%5d", ary[a]);
	}
		printf("\n");
 
}
 
void printfOdd(int size, int ary[])  // print the odd values
{
	int a, num=0, newline =0;
 
	for(a=1; a< size; a++)
	{
		if(!(num%10)&& !newline) 
		{
			printf("\n");
			newline=1;
		}
		 if(ary[a]%2)
		 {
			 if(newline)
				 newline=0;
			 printf("%5d", ary[a]);
			 num++;
		 }
 
	}
}
 
long sum (int size, int ary[])
{
	int a;
	long sum=0;
 
	for(a=0; a<size; a++)
		sum += ary[a];	
 
	return sum;
}
 
int largest (int size, int ary[]) 
{
	int a, large_index=0;
 
	for(a=0; a<size; a++)
		if(ary[a] > ary[large_index])
			large_index=a;
		return large_index;
}
 
void getNegatives(int ary[]) 
{
	int a, b, negAry[100];
 
	for(b=0, a=0; a<100; a++)
	{
		if(ary[a]<0)
		{
			negAry[b]=ary[a];
			b++;
		}
	}
 
 
	printf("\n\n---random number is divisible by 3 or 7, is stored as negative number---\n");	
	printfAll(b, negAry);
}
 
 
 
 
main()
{
	int aryA[100], i;
 
	srand(time(NULL));
	for (i=0; i<100; i++)
	{
		aryA[i] = rand()%999+1;
 
		if((aryA[i]%3 ==0)|| (aryA[i]%7 ==0))
			aryA[i]=-aryA[i];
	}
 
 
	printf("\n\n---Prac 2a.Print the array 10 values to a line---\n");
	printfAll(100, aryA);
 
	printf("\n\n---Prac 2b.Odd numberred index location, ten to a line---\n");	
	printOddIdx(100, aryA);
 
	printf("\n\nPrac 2c.Sum of array %ld\n",  sum(100, aryA));
 
	printf("\n\nPrac 2d.Largest index of array is =  %d\n",  largest(100, aryA)); 
 
	getNegatives(aryA);
}