ulang=false
while (not ulang)
system 'cls'
puts '======Kalkulator Ruby Created By Nick Dotnr======'
puts '1. penjumlahan'
puts '2. pengurangan'
puts '3. perkalian'
puts '4. pembagian'
puts '5. modulo'
puts '================================================='
print 'Masukan Pilihan : '
x = gets.to_i
def masukan
print 'masukkan a = '
@a = gets.to_i
print 'masukkan b = '
@b = gets.to_i
end