The f is called a literal suffix and it doesn't mean "frame" it means float and it tells the compiler to treat the number literal as a float type. You have to use the f suffix because Time.timeScale is a float typed variable and double type literals can't be automatically converted to float.
// Works, because 1 is an int and int auto-casts// to float because float is bigger than int.Time.timeScale=1;// Doesn't work, because 1.0 is a double and double// won't auto-cast to float since float is smaller than double.Time.timeScale=1.0;// Works, because 1.0f is a float and doesn't need to be cast.Time.timeScale=1.0f;// Works, despite 1.0 being a double because we are// explicitly casting it to a float.Time.timeScale=(float)1.0;
It has nothing to do with Unity, units, or time scales, it's just basic operation of a strongly typed language.
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The f is called a literal suffix and it doesn't mean "frame" it means float and it tells the compiler to treat the number literal as a float type. You have to use the f suffix because Time.timeScale is a float typed variable and double type literals can't be automatically converted to float.
It has nothing to do with Unity, units, or time scales, it's just basic operation of a strongly typed language.