Write the definition of a function signOf, that receives an integer parameter and returns a -1 if the parameter is negative, returns 0 if the parameter is 0 and returns 1 if the parameter is positive.
So, if the parameter 's value is 7 or 803 or 141 the function returns 1. But if the parameter 's value is -22 or -57, the function returns -1. And if the parameter 's value is 0, the function returns 0.