derivative, C++ (gcc)

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//g++  7.4.0

//derivative function
//credit for derivative function code goes to John R Hubbard, University of Richmond; other function and test driver codes are created by Rezaul Hoque on July 23,2021; contact: jewelmrh@yahoo.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;

#include <iostream>
#include <cmath>
using namespace std;
double derivative (double (*) (double),double,double);
double sroot(double);
double expo(double );

double sroot(double b){// sqrt() defined in cmath does the same thing
return(pow(b,0.5));
}
double expo(double t){//exp() defined in cmath does the same thing
return(pow(2.71818,t));
}
double derivative (double (*pf)(double t), double x, double h){
return ((*pf)(x+h)  - (*pf)(x-h))/(2*h);
}
int main(){
cout<<derivative (sroot,4,0.001)<<endl;
cout<<derivative (sin,0.5236,0.001)<<endl;
cout<<derivative (expo,0,0.001)<<endl;
cout<<derivative (log,1,0.01)<<endl;
return 0;
}

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Compilation time: 0.42 sec, absolute running time: 0.15 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 0,72 sec