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    1) Fix the return type of main. It's not relevant to the question, but is just bad practice IMO. 2) How did you build your program? Commented Jan 3, 2017 at 6:37
  • It's not 'the output of this program'. Your program does not make any output, because it does not run. It's output of a compiler. Commented Jan 3, 2017 at 6:38
  • Read your warnings they spell it out. See See What should main() return in C and C++? Commented Jan 3, 2017 at 6:39