c++ - Which is faster/preferred: memset or for loop to zero out an array of doubles?

Question

double d[10];
int length = 10;

memset(d, length * sizeof(double), 0);

//or

for (int i = length; i--;)
  d[i] = 0.0;

Answer 1

If you really care you should try and measure. However the most portable way is using std::fill():

std::fill( array, array + numberOfElements, 0.0 );