C++ Notes: Example - Celsius to Fahrenheit loop

Rather than read only one data point and terminate, as Celsius to Fahrenheit does, it's much more common to read in a loop. Here is the typical idiom for doing that. 
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// basics/c2f-loop.cpp - Celsius to Fahrenheit loop.
// Fred Swartz, 2003-10-29 

#include <iostream>
using namespace std;

int main() {
    float celsius;
    float fahrenheit;
    
    cout << "Celsius to Fahrenheit conversion." << endl;
    
    while (cin >> celsius) {                // (1)
        fahrenheit = 1.8 * celsius + 32;
        cout << "Fahrenheit = " << fahrenheit << endl;
    }
    
    return 0;
}
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Notes

  1. Because the read from cin produces a value that can be tested, this loop will continue while the read is successful, and fail when there is an EOF or bad input.

    See Idiom - cin loop for more discussion of this.