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// File: temperature.cxx
// This program prints a table to convert numbers from one unit to another.
// The program illustrases some implementation techniques.
#include <iostream> // Provides cout
#include <iomanip> // Provides setw function for setting output width
#include <cstdlib> // Provides EXIT_SUCCESS
#include <cassert> // Provides assert function
using namespace std; // Allows all standard library items to be used
double celsius_to_fahrenheit(double c)
// Precondition: c is a Celsius temperature no less than absolute
// zero (-273.16).
// Postcondition: The return value is the temperature c converted to Fahrenheit
// degrees.
{
const double MINIMUM_CELSIUS = -273.16; // Absolute zero in Celsius degrees
assert(c >= MINIMUM_CELSIUS);
return (9.0 / 5.0) * c + 32;
}
void setup_cout_fractions(int fraction_digits)
// Precondition: fraction_digits is not negative.
// Postcondition: All double or float numbers printed to cout will now be
// rounded to the specified digits on the right of the decimal.
{
assert(fraction_digits > 0);
cout.precision(fraction_digits);
cout.setf(ios::fixed, ios::floatfield);
if (fraction_digits == 0)
cout.unsetf(ios::showpoint);
else
cout.setf(ios::showpoint);
}
int main( )
{
const char HEADING1[] = " Celsius"; // Heading for table's 1st column
const char HEADING2[] = "Fahrenheit"; // Heading for table's 2nd column
const char LABEL1 = 'C'; // Label for numbers in 1st column
const char LABEL2 = 'F'; // Label for numbers in 2nd column
const double TABLE_BEGIN = -50.0; // The table's first Celsius temp.
const double TABLE_END = 50.0; // The table's final Celsius temp.
const double TABLE_STEP = 10.0; // Increment between temperatures
const int WIDTH = 9; // Number chars in output numbers
const int DIGITS = 1; // Number digits right of decimal pt
double value1; // A value from the table's first column
double value2; // A value from the table's second column
// Set up the output for fractions and print the table headings.
setup_cout_fractions(DIGITS);
cout << "CONVERSIONS from " << TABLE_BEGIN << " to " << TABLE_END << endl;
cout << HEADING1 << " " << HEADING2 << endl;
// Each iteration of the loop prints one line of the table.
for (value1 = TABLE_BEGIN; value1 <= TABLE_END; value1 += TABLE_STEP)
{
value2 = celsius_to_fahrenheit(value1);
cout << setw(WIDTH) << value1 << LABEL1 << " ";
cout << setw(WIDTH) << value2 << LABEL2 << endl;
}
return EXIT_SUCCESS;
}
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