It’s easy:\u00a0always use decimals for variables that represent money.<\/p>\n
Reason to avoid floats or doubles: They will produce incorrect results when you try to calculate something. I have to add, it will produce errors in very rare<\/strong> cases. However you can avoid it by using decimals!<\/p>\n You don’t believe me? Try this: 77.1 * 850 should be exactly 65,535.<\/p>\n decimal correct = (decimal)77.1 * (decimal)850d;<\/p>\n correct will be = 65535<\/p>\n double incorrect = (double)77.1 * (double)850;<\/p>\n incorrect will be = 65534.999999999993<\/p>\n Why is that? That’s because 0.1 has no exact representation in binary… it’s a repeating binary number. It’s sort of like how 1\/3 has no representation in decimal. 1\/3 is 0.33333333 and you have to keep writing 3’s forever. If you lose patience, you get something inexact.<\/p>\n So what are the downsides to decimal?<\/p>\n It’s easy:\u00a0always use decimals for variables that represent money. Reason to avoid floats or doubles: They will produce incorrect results when you try to calculate something. I have to add, it will produce errors in very rare cases. However you can avoid it by using decimals! You don’t believe me? Try this: 77.1 * 850 … Continue reading Why are decimals a good idea?<\/span> \n