C++ Part 19

The switch statement is the only other kind of C++ statement that implements
multi way branches.

switch Statement switch (Controlling_Expression) { case Constant_1: Statement_Sequence_1 break; case Constant_2: Statement_Sequence_2 break; . . . case Constant_n: Statement_Sequence_n break; default: Default_Statement_Sequence }

Example :

#include <iostream> using namespace std; int main() {    int vehicleClass; double toll; cout << "Enter vehicle class '1-3': "; cin >> vehicleClass; switch (vehicleClass) { case 1: cout << "Passenger car."; toll = 0.50; break; case 2: cout << "Bus."; toll = 1.50; break; case 3: cout << "Truck."; toll = 2.00; break; default: cout << "Unknown vehicle class!"; } /* If you forget this break, then passenger cars will pay $1.50. You need not place a break statement in each case. If you omit a break, that case continues until a break (or the end of the switch statement) is reached. */    return 0; }

Intro to C++ Part 12

• How Do I Start a Program? 

1.  Identify inputs and outputs.
2. Understand what you asked for ( Ask Questions ).
3. Break the program down. // Functions
4. into steps, writing each step in pseudocode English.
5.  Replace each pseudocode step with C++ codes.

Intro to C++ Part 6

A Sample C++ Program  

##include <iostream>
using namespace std;The following line says that main is a function with no parameters that returns an int(integer) value:int main( )Some compilers will allow you to omit the int or replace it with void, which indicates
a function that does not return a value. However, the previous form is the most
universally accepted way to start the main function of a C++ program.
The program ends when the following statement is executed:return 0;