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For example, i can assign the result of function call to a variable.
Or i can pass a variable for a routine to use it to save its result to it.
So, What is the benefit of output parameters?
Suppose the routine has more than one result? You could have several output parameters.
In languages where you return complex objects we will tend to make, say, a CartesianCoordinate result object, but otherwise it can be useful to have an outX and an outY parameter.