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ccompiler-warningsgcc-warning

C method gives warning: expression result unused and freezes

I have small problem with my home task. I have to create a method that sums an array, but with specific, given step. I did something like this: 

int sum_step(int t[], int size, int step)
{
   int i;
   int sum = 0;

   for(i=0; i < size; i+step)
   {
      sum += t[i];
   }

   return sum;
}

and console returns warning:

warning: expression result unused
  [-Wunused-value]
  i + step;
  ~ ^ ~~~~

Someone knows what is wrong? Thank in advance!

Solution

  • In following for statement the third expression i+step does nothing.

    for (i = 0; i < size; i + step)

    You probably want i to be incremented by step after each iteration so you should write this:

    for (i = 0; i < size; i += step)