const int SIZE = 10;


void merge(double s1[], double s2[], double target[])
{
    int i; // Loop control variable

    for (i = 0; i < SIZE; i++)
    {
	target[i] = s1[i];
    }

    for (i = 0; i < SIZE; i++)
    {
	target[i + SIZE] = s2[i];
    }
}

void interleave(double s1[], double s2[], double target[])
{
    int i; // Loop control variable

    for (i = 0; i < SIZE; i++)
    {
	// s1[0] goes to target[0]
	// s1[1] goes to target[2]
	// s1[2] goes to target[4]
	// s1[3] goes to target[6]
	// In general: s1[i] goes to target[2*i]
	target[2*i] = s1[i];
    }

    for (i = 0; i < SIZE; i++)
    {
	// s2[0] goes to target[1]
	// s2[1] goes to target[3]
	// s2[2] goes to target[5]
	// s2[3] goes to target[7]
	// In general: s1[i] goes to target[2*i + 1]
	target[2*i + 1] = s2[i];
    }

}