Write a Stub for the Function Whose Declaration Is Given

Essay

Write a stub for the function whose declaration is given below.Do not write a program that calls this,just write the stub.
Hint: This is very short.
double yield (double pressure,
double density,double temp);
// Precondition: pressure is newtons per square meter
// density is in kilograms per cubic meter
// temp is in degrees Celcius
// Postcondition: Return value is the relative yield of
// a chemical process.It is a number between 0 and 1.
// 0 means no output and 1 means ideal yield.