Thread: How do you match 2 files?

I am reading in two files so that I can print a report.
The 2 files have one thing in common and that is an Id number
(CustomerId & orderId).

I thought a simple if() statement would do it but it did not.
How can I takle this problem????

Thanks for your help..
This is what I inserted in the report part:

Code:

if(CustomerId = orderId)
{
fprintf(summaryFilePtr, "%c %76s %c\n", 179, "", 179);
	subTotal = installPrice - discountTotal;
	tax = subTotal * TAX_AMT;
    total = subTotal + tax;
	fprintf(summaryFilePtr, "%c %25s TOTAL %10s          $%03.2f   %13s %c\n", 179, "", "",
		total, "", 179);
	fprintf(summaryFilePtr, "%c %76s %c\n", 179, "", 179);
	}//end if