foo.cc: In function 'int main()':
foo.cc:8:3: error: 'sum' was not declared in this scope
    8 |   sum += h;
      |   ^~~
foo.cc:12:17: error: 'sum' was not declared in this scope
   12 |  printf("%.2f", sum;)
      |                 ^~~
foo.cc:12:21: error: expected primary-expression before ')' token
   12 |  printf("%.2f", sum;)
      |                     ^

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