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

#define SIZE 2


int seed()
{
        //this is to get some better values out of the randomize funktion
        int i, stime;
        long ltime;

        /* get the current calendar time */
        ltime = time(NULL);
        stime = (unsigned) ltime/2;
        srand(stime);

}

int menu()
{
        int choice =0;

        while(choice <1 || choice > 6)
        {
                printf("\n\nMenu for lab4\n\n 1. Enter numbers into array\n 2. Print the arrays\n 3. Add the arrays\n 4. Transpose the arrays\n 5. Multiply the arrays\n\n 0.Exit the program\nYour choice:");
                scanf("%d",&choice);
                return choice;

        }

}

int enterArray(int (*ptrOne)[SIZE], int(*ptrTwo)[SIZE])
{
        int choice = 0;
        while(choice >3 || choice <1)
        {
                printf("\n\n Lets add some numbers to the array:\n 1. Manually\n 2. Let the computer randomize some numbers for us\nYour choice: ");
                scanf("%d", &choice);
        }
        int i,j,k;
        switch(choice)
        {
                case 1:
                {
			for(k=0; k<2; k++)
			{	
                        	for(i=0; i<SIZE; i++)
                	        {
					for(j=0; j<SIZE; j++)
					{
	                        	        printf("\nEnter number into array nr %d [%d][%d]: ",k,i,j);
						if(k)
						{
        	        	                	scanf("%d",(*(ptrTwo + j)+i));
						}
						else
						{
							scanf("%d",(*(ptrOne + j)+i));
						}
					}
					
	                        }
			}
                        break;
                }
                case 2:
                {
                        seed(); // seed the random function
	        	for(k=0; k<SIZE; k++)
			{
		                for(i = 0; i<SIZE; i++)
        	                {
					for(j = 0; j<SIZE; j++)
					{
						if(k)
	                        			*(*(ptrTwo + i)+j) = rand() % 10;
						else
							*(*(ptrOne + i)+j) = rand() % 10;
					}

        	                }
			}
                        break;
                }
        }
        return 0;

}
int printArray(int (*ptrOne)[SIZE], int (*ptrTwo)[SIZE])
{
	//some counters
	int i,j,k;
	for(k=0; k<2; k++) // so that we know what array we are printing from
	{
		printf("\n\nArray number: %d\n",k+1); 
		for(i = 0; i<SIZE; i++)
		{
			for(j = 0; j<SIZE; j++)
			{
				if(k)
					printf("%5d ",*(*(ptrTwo +i)+j));
				else
					printf("%5d ",*(*(ptrOne + i) + j));
				
			}
			printf("\n");

		}
	
	}
	return 0;
}

int addArray(int (*ptrOne)[SIZE], int (*ptrTwo)[SIZE], int (*ptrThree)[SIZE])
{
	//some counters
	int i,j;
	
	printf("If we add the two arrays we get: \n");
	for(i = 0; i < SIZE; i++)
	{
		for(j=0; j < SIZE; j++)
		{
			*(*(ptrThree +i) + j) = *(*(ptrOne + i) + j) + *(*(ptrTwo + i) + j);
			printf("%5d ",*(*(ptrThree + i ) + j));

		}
		printf("\n");
	}
	return 0;
}
int transcendArray(int (*ptrOne)[SIZE], int (*ptrTwo)[SIZE])
{
	
	//some counters
	int i,j,k;

	printf("\n This is the transcend of the arrays\n\n");
	for(k=0; k<2; k++) // so that we know what array we are printing from
	{
		printf("\n\nArray number: %d\n",k+1); 
		for(i = 0; i<SIZE; i++)
		{
			for(j = 0; j<SIZE; j++)
			{
				if(k)
					printf("%5d ",*(*(ptrTwo +j)+i));
				else
					printf("%5d ",*(*(ptrOne + j) + i));
				
			}
			printf("\n");

		}
	
	}

	return 0;
}

int multiplyArray(int (*ptrOne)[SIZE], int (*ptrTwo)[SIZE], int(*ptrThree)[SIZE])
{
	//some counters for the multplying we are about to do
	int i,j,k;
		for(i = 0; i < SIZE; i++)
		{
			for(j = 0; j < SIZE; j++)
			{
				for(k = 0; k < SIZE; k++)
				{
					*(*(ptrThree + j) +i) += *(*(ptrOne + k) + i) * *(*(ptrTwo + i) + k);
					printf("%5d ", *(*(ptrThree +i) + j));
				}
				printf("\n");
			}
		}

}

int main()
{
	//initialize the arrays and fill them up with zeros
	int arrayOne[SIZE][SIZE] = {};
	int arrayTwo[SIZE][SIZE] = {};
	int arrayThree[SIZE][SIZE] = {};

	//make pointers out of the arrays that we can use

	int (*ptrOne)[SIZE] = arrayOne;
	int (*ptrTwo)[SIZE] = arrayTwo;
	int (*ptrThree)[SIZE] = arrayThree;

	//init som variables
	int choice;

	//start up a while and look for menu choices
	while(choice = menu())
	{
		switch(choice)
		{
			case 1:
			{
				enterArray(ptrOne,ptrTwo);
				break;
			}

			case 2:
			{
				printArray(ptrOne,ptrTwo);
				break;
			}
			case 3:
			{
				addArray(ptrOne,ptrTwo,ptrThree);
				break;
			}
			case 4:
			{
				transcendArray(ptrOne,ptrTwo);
				break;
			}
			case 5:
			{
				multiplyArray(ptrOne,ptrTwo,ptrThree);
				break;

			}
		}


	}
	


}