输入三个整数x,y,z，请把这三个数由小到大输出。

1.程序分析：我们想办法把最小的数放到x上，先将x与y进行比较，如果x>y则将x与y的值进行交换，

　　　　　　然后再用x与z进行比较，如果x>z则将x与z的值进行交换，这样能使x最小。-Enter three integers x, y, z, please these three the number of small to large output.

A program analysis: we want to approach the smallest number on the x and compare the first x and y, if x> y then x and y values ​ ​ are exchanged,

Then compare the x and z, for x> z then x and z values ​ ​ to be exchanged, so make x the smallest.