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I don't understand why my arrays won't subtract

jdright (1)
This is HW. I have puzzled for 5 hours as to why case 6 will not work, but case 4 and case 5 give a correct result. I can upload the full code if needed but I hope this will be enough for someone to point me in the right direction. I expected the var[i] would copy all values from maxdefects[i]-mindefects[k], but it seem that the arrays maxdefects[i], mindefects[k] aren't even holding values. I tested this by trying a cout<<mindefects[2]; in case 4's cout lines.
Thank you in advance for any help you can offer.
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                 case 4: //done and debugged

			cout << "Enter a product number: ";
			cin  >> prodnum;


			while (prodnum > num_Products || prodnum < 0)
			{
				cout << "Invalid Entry. Try Again.";
				cin  >> prodnum;
			}
			for (i=0, k=0; i < days; i++, k++)
			{
				j = prodnum - 1;
				maxdefects[k] = defects[j][i];
			}
			max = 0;
			for (i=0; i < days; i++)
			{
				if (maxdefects[i] > max)
					max = maxdefects[i];
			}


			cout << endl << "The maximum for product "
				<< prodnum << " is "
				<< max << " defects." << endl;
			break;

		case 5://done and debugged

			cout << "Enter a product number: ";
			cin  >> prodnum;


			while (prodnum > num_Products || prodnum < 0)
			{
				cout << "Invalid Entry. Try Again.";
				cin  >> prodnum;
			}


			for (i=0, k=0; i < days; i++, k++)
			{
				j = prodnum - 1;
				mindefects[k] = defects[j][i];
			}

			min = mindefects[0];
			for (i=0; i < days; i++)
			{
				if (mindefects[i] < min)
					min = mindefects[i];
			}


			cout << endl << "The minimum for product "
				<< prodnum << " is "
			<< min << " defects." << endl;
			
			break;


		case 6:
			for (i=0; i < days; i++)
			{
				var[i] = maxdefects[i]-mindefects[k];
			}
			minvar=var[0];
			for (k=0; k< days; k++)
			{
				if ( var[k] < minvar)
					minvar = var[k];
			}
			cout<<"The minimum variance is "
				<<minvar<<endl;
			break;
Disch (13742)
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			for (i=0; i < days; i++)  // no 'k' here
			{
				var[i] = maxdefects[i]-mindefects[k];  // what is 'k'?
			}


What that supposed to be mindefects[i] ?
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