Question

How to use fma() function to calculate (x * y) + z in C++

Answer 1

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
	double x, y, z;

	x = 10.0, y = 20.0, z = 30.0;

	// x * y + z --- (x * y) + z
	cout << "fma(10.0, 20.0, 30.0) = " << fma(x, y, z) << endl;
	cout << "fma(0.1, 10, -1) = " << fma(0.1, 10, -1) << endl;

	return 0;
}

/*
run:

fma(10.0, 20.0, 30.0) = 230
fma(0.1, 10, -1) = 5.55112e-17

*/

 

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