package Ġcom . pay am . learn . solid . oc p Ċ Ċ class ĠAdd ition ( private Ġval Ġfirst Operand : ĠDouble , Ġprivate Ġval Ġsecond Operand : ĠDouble ) Ġ: ĠI Operation Ġ{ ĊĊĊĠĠĠ Ġoverride Ġfun Ġperform Operation (): ĠDouble Ġ{ ĊĠĠĠĠĠĠĠ Ġreturn Ġfirst Operand . plus ( second Operand ) ĊĊĠĠĠ Ġ} Ċ }