Supermarket Pricing Example

• Problem analysis: 4 main subtasks

  • print usage statement
  • input the data
  • compute the retail price of the item
  • output the results

void introduction( );

//Postcondition: Description of program is written on the screen.

void get_input(double& cost, int& turnover);

//Precondition: User is ready to enter values correctly.

//Postcondition: The value of cost has been set to the

//wholesale cost of one item. The value of turnover has been

//set to the expected number of days until the item is sold.

double price(double cost, int turnover);

//Precondition: cost is the wholesale cost of one item.

//turnover is the expected number of days until sale of the item.

//Returns the retail price of the item.

void give_output(double cost, int turnover, double price);

//Precondition: cost is the wholesale cost of one item; turnover is the

//expected time until sale of the item; price is the retail price of the item.

//Postcondition: The values of cost, turnover, and price have been

//written to the screen.

int main( )

{

double wholesale_cost, retail_price;

int shelf_time;

introduction( );

get_input(wholesale_cost, shelf_time);

retail_price = price(wholesale_cost, shelf_time);

give_output(wholesale_cost, shelf_time, retail_price);

return 0;

}

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