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How to calculate Execution Time of a Code Snippet in C++?
We can calculate the execution time of a code snippet by using following syntax −
auto start = high_resolution_clock::now(); // Start time // Code snippet auto stop = high_resolution_clock::now(); // Stop time auto duration = duration_cast<microseconds>(stop - start); // Duration
The class high_resolution_clock is defined in “chrono” header file. The function now() is returning a value corresponding to the call’s point in time.
A header file is used to record the time taken by that particular code.
#include <chrono> using namespace std::chrono;
The following is an example to calculate execution time of a code snippet.
Example
#include <iostream>
#include <chrono>
using namespace std::chrono;
using namespace std;
int sum(int x, int y) {
int s = x + y;
cout << "The sum of numbers : " << s;
}
int main() {
auto start = high_resolution_clock::now();
sum(28, 8);
auto stop = high_resolution_clock::now();
auto duration = duration_cast<microseconds>(stop - start);
cout << "\nTime taken by function : "<< duration.count() << " microseconds";
return 0;
}Output
The sum of numbers : 36 Time taken by function : 42 microseconds
In the above program, a function sum() is defined to calculate the sum of numbers.
int sum(int x, int y) {
int s = x + y;
cout << "The sum of numbers : " << s;
}In the main() function, we recorded the time taken by the function sum() by using some predefined functions and class “chrono”.
auto start = high_resolution_clock::now(); sum(28, 8); auto stop = high_resolution_clock::now(); auto duration = duration_cast<microseconds>(stop - start);
Updated on: 26-Jun-2020
2K+ Views
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