Problem with affectation or issue in the for Loop

I created an Array with two elements, and tried a comparison of static arrays, but the incrementation of them is not working like was expected,

the expected output is 1 1 but the output gives me every time 0 1

here is the C code :

#include <stdio.h>
#include <stdlib.h>

int main() {

  int a[] = {1, 2, 3};
  int b[] = {3, 2, 1};

  int *res = malloc(2 * sizeof(int));

  int sumA = 0, sumB = 0;
  for (int k = 0; k < 2; k++) {
    if (a[k] > b[k]) {
      printf("yes a\n");
      sumA += 1;
    } else if (a[k] < b[k]) {
      printf("yes b\n");
      sumB += 1;
    }
  }

  res[0] = sumA;
  res[1] = sumB;

  printf("%d, %d", res[0], res[1]);

  return 0;
}

I tried debugging the code but no solution, I think the for loop is the issue, I just need hints or permanent solution …

Looking for you help guys.

>Solution :

You’re not iterating over all the 3 valid indexes.

for (int k = 0; k < 3; k++)

Note: you can use sizeof a / sizeof *a to calculate the number of elements in the array.