public static void TestGSMCallHistory()
{
GSM gsm = new GSM("10", "Samsung");
gsm.PerformCall("0864743331", 110);
gsm.PerformCall("0891362423", 65);
gsm.PerformCall("0870303991", 304);
Console.WriteLine(gsm.PrintCallHistory());
Console.WriteLine(gsm.TotalCallsPrice(0.37));
Call call = gsm.CallHistory[0];
foreach (var historyCall in gsm.CallHistory)
{
if (call.Duration < historyCall.Duration)
{
call = historyCall;
}
}
gsm.CallHistory.Remove(call);
Console.WriteLine(gsm.TotalCallsPrice(0.37));
gsm.ClearCallHistory();
Console.WriteLine(gsm.PrintCallHistory());
}