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    Python Program to Convert Celsius to Fahrenheit

    easyInput and operatorsPython

    A formula program that also teaches something important about Python 3: the / operator always gives a decimal answer.

    The question

    Read a temperature in Celsius (an integer) and print it in Fahrenheit using F = C × 9 / 5 + 32.

    The code

    program.py

    c = int(input())
f = c * 9 / 5 + 32
print("Fahrenheit =", f)
    Try it Yourself »

    Input

    70

    Output

    Fahrenheit = 158.0

    How it works

    1. 1Read the temperature in Celsius.
    2. 2Apply F = C × 9 / 5 + 32. Multiplication and division happen before addition.
    3. 3Because / produces a float, a whole answer such as 212 prints as 212.0.

    Common mistakes

    • Writing C * (9 / 5 + 32) — the brackets change the order and the answer is wrong.
    • Using // (floor division), which throws away the decimal part.

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    Practice questions

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