已知输入x,y,z这3个不相等的整数,设计一个算法,使得这3个数按从大到小的顺序输

俺上学的时候只学过basic.
10 INPUT "x="; x
20 INPUT "y="; y
30 INPUT "z="; z
40 IF x > y THEN 60
45 m = x
46 x = y
47 y = m
60 IF x > z THEN 80
65 m = x
66 x = z
67 z = m
80 IF y > z THEN 100
85 m = y
86 y = z
87 z = m
100 PRINT x; ">"; y; ">"; z
120 END