Question

I have an array,

int a[size];

I want to set all the array elements to 1

because some of the indexes in the array are already set to 1 so would it better checking each element using a conditional statement like,

for (int index = 0; index < size; index++)
{
    if (a[index] != 1)
      a[index] = 1;
}

or set all the indexes no matter what. what would be the difference?

Answer 1

Just set all the elements to 1. Code for simplicity and readability first. If you find that the code runs too slow, profile it to see where improvements need to be made (although I highly doubt performance problems can come from setting elements of an array of integers to a certain value).