要能够打印出条码条，目前我的条码还不能打印出条码，我不知道问题出在哪，我想请问哪位高手给我点指示。-to be able to print bar codes, I present the barcode can not print bar codes, I do not know what was the problem, I would like to ask the experts who point to my instructions.

输入三个数，求他们的和。平均值，最大，最小数-Enter the three numbers, ask them and. Average, maximum, minimum number