Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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#include <iostream>
#include <cmath>
using namespace std;
// declare functions
void display_menu();
void convert_temp();
double to_celsius(double fahrenheit);
double to_fahrenheit(double celsius);
int main() {
cout << "Convert Temperatures\n\n";
display_menu();
char again = 'y';
while (again == 'y')
{
convert_temp();
cout << "Convert another temperature? (y/n): ";
cin >> again;
cout << endl;
}
cout << "Bye!\n";
}
// define functions
void display_menu()
{
cout << "MENU\n"
<< "1. Fahrenheit to Celsius\n"
<< "2. Celsius to Fahrenheit\n\n";
}
void convert_temp()
{
int option;
cout << "Enter a menu option: ";
cin >> option;
double f = 0.0;
double c = 0.0;
switch (option)
{
case 1:
cout << "Enter degrees Fahrenheit: ";
cin >> f;
c = to_celsius(f);
c = round(c * 10) / 10; // round to one decimal place
cout << "Degrees Celsius: " << c << endl;
break;
case 2:
cout << "Enter degrees Celsius: ";
cin >> c;
f = to_fahrenheit(c);
f = round(f * 10) / 10; // round to one decimal place
cout << "Degrees Fahrenheit: " << f << endl;
break;
default:
cout << "You must enter a valid menu number.\n";
break;
}
}
double to_celsius(double fahrenheit)
{
double celsius = (fahrenheit - 32.0) * 5.0 / 9.0;
return celsius;
}
double to_fahrenheit(double celsius)
{
double fahrenheit = celsius * 9.0 / 5.0 + 32.0;
return fahrenheit;
}
  • Now, modify it to do the following:
    • Modify the while loop to utilize tolower() or toupper().
    • Add default values to the to_celsius() and to_fahrenheit() functions.
      • Use the temperature when water freezes!

    • Add two more functions to handle another type of conversion (kilograms to pounds) and use function overloading.
      • Overload the functions with double and int data types.

      • Example (requiring four new functions):
        • Kilograms to Pounds (using double)
        • Pounds to Kilograms (using double)
        • Kilograms to Pounds (using int)
        • Pounds to Kilograms (using int)
    • Add the factorial function that works by using recursion.
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