In C++ We take for granted all the place that we see arrays on a daily basis. On
ID: 3833377 • Letter: I
Question
In C++
We take for granted all the place that we see arrays on a daily basis. One that I know I'm sure familiar with is the one I interact with on my commute as I aimlessly scan through my radio dial looking for something, anything(!), to listen to on my way to work or home. Today you will create a radio interface that:
Uses arrays to hold data for FM1, FM2, AM, and either a CD or MP3 folder
each radio cluster will hold 6 radio entries
the CD or MP3 folder will hold at least 10 songs
Uses named constants to control the sizes of the arrays and the looping mechanisms
Uses formatted output to properly display a radio control set and radio output
Clearly shows the driver what is on the radio (the station at least)
Clearly indicates to the driver how to interact (change stations)
Repaints the display so the driver can see what's going on (you can use system dependent code here)
Function to allow the user to change / save a radio station into saved stations
Loops as long as the driver has the car running and until the key is removed (option to kill radio)
Explanation / Answer
void COperationsDlg::OnAddition() { UpdateData(); double Number1, Number2, Result; if( m_Operand1.IsEmpty() ) Number1 = 0; else Number1 = atof(m_Operand1); if( m_Operand2.IsEmpty() ) Number2 = 0; else Number2 = atof(m_Operand2); Result = Number1 + Number2; m_Result.Format("%.2f", Result); UpdateData(FALSE); } void COperationsDlg::OnSubtraction() { UpdateData(); double Number1, Number2, Result; if( m_Operand1.IsEmpty() ) Number1 = 0; else Number1 = atof(m_Operand1); if( m_Operand2.IsEmpty() ) Number2 = 0; else Number2 = atof(m_Operand2); Result = Number1 - Number2; m_Result.Format("%.2f", Result); UpdateData(FALSE); } void COperationsDlg::OnMultiplication() { UpdateData(); double Number1, Number2, Result; if( m_Operand1.IsEmpty() ) Number1 = 0; else Number1 = atof(m_Operand1); if( m_Operand2.IsEmpty() ) Number2 = 0; else Number2 = atof(m_Operand2); Result = Number1 * Number2; m_Result.Format("%.2f", Result); UpdateData(FALSE); } void COperationsDlg::OnDivision() { double Number1, Number2, Result; UpdateData(); if( m_Operand1.IsEmpty() ) Number1 = 0; else Number1 = atof(m_Operand1); if( m_Operand2.IsEmpty() ) Number2 = 0; else Number2 = atof(m_Operand2); Result = Number1 / Number2; m_Result.Format("%.2f", Result); UpdateData(FALSE); } void COperationsDlg::OnAddition() { UpdateData(); double Number1, Number2, Result; if( m_Operand1.IsEmpty() ) Number1 = 0; else Number1 = atof(m_Operand1); if( m_Operand2.IsEmpty() ) Number2 = 0; else Number2 = atof(m_Operand2); Result = Number1 + Number2; m_Result.Format("%.2f", Result); UpdateData(FALSE); } void COperationsDlg::OnSubtraction() { UpdateData(); double Number1, Number2, Result; if( m_Operand1.IsEmpty() ) Number1 = 0; else Number1 = atof(m_Operand1); if( m_Operand2.IsEmpty() ) Number2 = 0; else Number2 = atof(m_Operand2); Result = Number1 - Number2; m_Result.Format("%.2f", Result); UpdateData(FALSE); } void COperationsDlg::OnMultiplication() { UpdateData(); double Number1, Number2, Result; if( m_Operand1.IsEmpty() ) Number1 = 0; else Number1 = atof(m_Operand1); if( m_Operand2.IsEmpty() ) Number2 = 0; else Number2 = atof(m_Operand2); Result = Number1 * Number2; m_Result.Format("%.2f", Result); UpdateData(FALSE); } void COperationsDlg::OnDivision() { double Number1, Number2, Result; UpdateData(); if( m_Operand1.IsEmpty() ) Number1 = 0; else Number1 = atof(m_Operand1); if( m_Operand2.IsEmpty() ) Number2 = 0; else Number2 = atof(m_Operand2); Result = Number1 / Number2; m_Result.Format("%.2f", Result); UpdateData(FALSE); }