Exercise: Fahrenheit

Write a function function toFahrenheit(c) that converts the temperature c from degrees Celsius to degrees Fahrenheit by the formula F = C × 1.8 + 32.

• toFahrenheit(100) → 212
• toFahrenheit(-40) → -40
• toFahrenheit(36.6) → 97.88

Constraints: c is a number, whole or fractional, not below absolute zero, -273.15; the result is compared with the expected one to within 0.000000001. The tests write it as Math.abs(got - 212) < 1e-9: 1e-9 is 0.000000001, Math.abs drops the sign of the difference, and < means "less than".

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