foo.cc: In function 'int main()':
foo.cc:44:18: error: 'null' was not declared in this scope
   44 |  if(marray[0] == null)
      |                  ^~~~
foo.cc:64:21: error: expected ';' before '}' token
   64 |    temp += marray[i]
      |                     ^
      |                     ;
   65 |   }
      |   ~                  

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