When t is used on its own in the expression, an array-to-pointer conversion takes place, this produces a pointer to the first element of the array. When t is used as the argument of the & operator, no such conversion takes place. The & then explicitly takes the address of t (the array). &t is … Read more
delete [] does know the size that was allocated. However, that knowledge resides in the runtime or in the operating system’s memory manager, meaning that it is not available to the compiler during compilation. And sizeof() is not a real function, it is actually evaluated to a constant by the compiler, which is something it … Read more
Change the line where you define selectedexpression to selectedexpression=${expressions[ $RANDOM % ${#expressions[@]} ]} You want your index into expression to be a random number from 0 to the length of the expression array. This will do that.