int difference, year=0, industry = 0, industrytwo = 0, industry1value=0, industry2value=0;
	printf("Please select year from 2011 to 2016.\n");
	scanf_s("%d", &year);
	printf("Please select industry.\n 1: Construction\n 2: Manufacturing\n 3: Marine\n 4: Transportation & Storage\n 5: Water Supply & Sewerage\n 6: Whole sale & Retail\n");
	scanf_s("%d", &industry);
	printf("hello");
	if (industry == 1)
	{
		industry1value = con[year - 2011];
	}
	else if (industry == 2)
	{
		industry1value = man[year - 2011];
	}
	else if (industry == 3)
	{
		industry1value = marine[year - 2011];
	}
	else if (industry == 4)
	{
		industry1value = TS[year - 2011];
	}
	else if (industry == 5)
	{
		industry1value = WSS[year - 2011];
	}
	else if (industry == 6)
	{
		industry1value = WSR[year - 2011];
	}
	printf("Please select industry.\n 1: Construction\n 2: Manufacturing\n 3: Marine\n 4: Transportation & Storage\n 5: Water Supply & Sewerage\n 6: Whole sale & Retail\n");



	scanf_s("%d", &industrytwo);



	printf("hello");
	if (industrytwo == 1)
	{
		industry2value = con[year - 2011];
	}
	else if (industrytwo == 2)
	{
		industry2value = man[year - 2011];
	}
	else if (industrytwo == 3)
	{
		industry2value = marine[year - 2011];
	}
	else if (industrytwo == 4)
	{
		industry2value = TS[year - 2011];
	}
	else if (industrytwo == 5)
	{
		industry2value = WSS[year - 2011];

	}
	else if (industrytwo == 6)
	{
		industry2value = WSR[year - 2011];

	}

	difference = industry2value - industry1value;
	printf("Difference is %d.\n", difference);

}