Get the running time of a function in c++

Question

I want to calculate the running time of a function for my assignment. I keep getting 0 nut my teacher strictly said that he want some non zero value even for a loop of 10 size. My code so far is this

#include <chrono>

using namespace std;
using std::chrono::duration_cast;
using std::chrono::nanoseconds;
using std::chrono::steady_clock;

steady_clock::time_point t1 = steady_clock::now();
for(int i=0;i<times;i++){
    bubbleSort(arr,size);
}
steady_clock::time_point t2 = steady_clock::now();
cout<<(float)duration_cast<nanoseconds>(t2-t1).count()/times<<"     ";

i have also tried chrono::high_resolution_clock , clock() and many others. The main problem is that i have to give some non zero value for time=1; and size=10. Please suggest how could i do this?

Answer 1

I tried running your code, commenting the bubbleSort part of course. It is giving some non zero value. Try this :

cout<<(float)duration_cast<nanoseconds>(t2-t1).count()/(float)times<<"     ";