Ruby言語 でじゃんけん

pc = ["グー","チョキ","パー"]
pcnum = rand(3)
puts "PCは#{pc[pcnum]}"
puts "私は#{pc[name]}"
puts "シャンケンの判定は"
ans = ((name - pcnum)+3)%3//
if(ans == 0)
puts "アイコ"
elsif(ans == 2)
puts "勝ち"
elsif(ans == 1)
puts "負け"
end