[NaS]

A simple loop.

Код:

for(new i = sizeof(array) - 1; i > 0; i --)
{
array[i] = array[i - 1];
}

array[0] = new_value;

Assuming an array size of 5, it first moves index 3 to 4, then 2 to 3, then 1 to 2 and last 0 to 1.
After that overwrite index 0 with the new value.