#include <stdio.h>
#define SIZE 30

void readFromFile(double myArr[][SIZE])
{
	int r , c;
	FILE *inpFunc;
	inpFunc = fopen("matrix.txt","r");

	for ( r= 0; r <7 ; r++)
		for (c = 0; c < 4; c++)
		fscanf(inpFunc,"%lf",&myArr[r][c]);

}

void display(double myArr[][SIZE])
{
	int r, c;

	for (r = 0; r < 7; r++)
	{
		for (c = 0; c < 4; c++)
		{
			printf("%.1lf ", myArr[r][c]);
		}
		printf("\n");
	}
}

int main(void)
{

	double myArr[SIZE][SIZE],swapArr[SIZE];
	int num1, num2,r,c;
	readFromFile(myArr);
	display(myArr);

	do
	{
		printf("Enter two row indices to swap: ");
		scanf("%d %d", &num1, &num2);
	} while ( !(num1>=0 && num1<7 && num2>=0 && num2<7) );

	for (r = 0; r < 4; r++)
	{
		swapArr[r] = myArr[num1][r];

	}

	for (r = 0; r < 4; r++)
	{
		myArr[num1][r] = myArr[num2][r];
	}
	for (r = 0; r < 4; r++)
	{
		myArr[num2][r] = swapArr[r];
	}


	printf("\n");
	printf("\nThe contents of the array AFTER the swap operation\n");
	display(myArr);

	return 0;
}