#!/usr/bin/env ruby

kazu=[2,4,6,8,10,12,14,16,18,20]
kyoka=["算数","体育","理科","図工","国語","家庭科","外国語","社会","音楽"]

printf("%d\n",kazu[5])
printf("%s\n",kyoka[8])

srand
suzi=rand(10)
printf("%d\n",kazu[suzi])
benkixyo=rand(9)
printf("%s\n",kyoka[benkixyo])
num=rand(10)
printf("%d\n",kazu[num])
sta=rand(9)
printf("%s\n",kyoka[sta])