riemann, C++ (gcc)

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//g++  7.4.0

//riemann function
//credit for riemann 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 riemann(double (*)(double),double, double,int);
double sroot(double);
double expo(double);
double riemann(double (*pf)(double t), double a, double b, int n){
double s=0, h=(b-a)/n, x;
int i;
for (x=a, i=0;i<n; x+=h, i++)
s += (*pf)(x);
return s*h;
}
double sroot(double b){//same as sqrt defined in cmath
return(pow(b,0.5));
}
double expo(double t){// same as exp defined in cmath
return(pow(2.71828,t));
}
int main()
{
cout<<riemann(sroot, 1,4,1000)<<endl;
cout<<riemann(cos,0,3.1416/2,1000)<<endl;
cout<<riemann(expo, 0,1,1000)<<endl;
cout<<riemann(log, 1,2.71828,1000)<<endl;
return 0;
}

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Compilation time: 0.52 sec, absolute running time: 0.15 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 0,76 sec