Question

I have this method and the error is:

\Supp.cpp:35:6: attention : variable 'temp' set but not used [-Wunused-but-set-variable]

I don’t understand why.

void parcourir_index(int * vec){
  int i;
  int temp;
  for (i = 0; i < n; i++) {
    temp = vec[i];
  }
}

Answer 1

Because temp is a local variable, and there is no reference of it after’temp=vec[i]’, the compiler will consider temp as redundent, and it will be eliminated by a pass called Dead Code Elimination.