ruby 100以内的随机加减法

[size=large][size=large]# 注：仅供参考

# 加数
addend = 0
# 被加数
meiosis = 0
# 运算符
operator = ''
# 得数
solution = 0
# 随机加数与被加数
addend = rand(100)
meiosis = rand(100)
# 判断运算符(得出来的都是正整数)
operator = addend > meiosis ? '-' : '+'
# 运算
operator = addend > meiosis ? "#{addend-meiosis}" : "#{addend+meiosis}"
# 结果
p operator[/size][/size]