C语言的几个小程序，四舍五入的方式精确到小数点后第四位，把一张一元钞票,换成一分、二分和五分硬币,每种至少11枚,问有多少种方案?-C language, a few small programs：Rounded to the nearest way to fourth place, to a one dollar bill, replaced by a point, two points and five coins, each at least 11, and asked how many