Question

Declare and define a C++ class called odometer that will track miles driven and gallons used by a vehicle. The class should have member variables for “total miles driven” and “gallons consumed”. Include the following mutator functions in your class:

• miles driven and gallons of gas consumed • reset odometer to zero

• reset gallons

Answer 1

Dear Student,

1. Mutator functions are those functions which is used to modify the value of member variables.

2. Mutator function must have atleast one parameter value to be assigned to member variables.

3. Data type of parameter must match with the data type of data member.

4. Mutator function not required to return a value.

5. General naming convention of mutator function is that it must start with set. e.g. setName(), setAddress() etc

6. Now coming to the question, please see the below Odometer class screenshot for declaring mutator functions and two member variables milesDriven & gallonsOfGasConsumed. Class is very simple self understandable though the comments are written with each of the line.

7. Above code in textual format is mentioned below:-

#include<iostream>

using namespace std;

//Declaration of Class Odometer
class Odometer {

//Declare two private variables milesDriven and gallonsOfGasConsumed
private :
float milesDriven, gallonsOfGasConsumed;

public:

   //Mutator Function to set the miles driven
void setMilesDriven(float milesDriven_parameter){
   milesDriven=milesDriven_parameter;
}
  
//Mutator function to set the gallonsofgasconsumed
void setGallonsOfGasConsumed(float gallonsOfGasConsumed_parameter){
   gallonsOfGasConsumed=gallonsOfGasConsumed_parameter;
}
  
//Mutator function to Reset miles driven
void resetMilesDriven(){
   milesDriven=0;
}
  
//Mutator function to Reset Gallongs of gas consumed
void resetGallonsOfGasConsumed(){
   gallonsOfGasConsumed=0;
}
};

int main(){
  
}

8. Output of the code is nothing as the question is for declaring and defining a class only but still showing the below screenshot that the code was getting compiled successfully.

9. Still if you feel any questions or query, please feel free to reach me through comments section. I will reply to your query as early as possible.

Thanks!!