foo.cpp: In function 'int mian()':
foo.cpp:12:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
C:/TDM-GCC-32/bin/../lib/gcc/mingw32/4.9.2/../../../libmingw32.a(main.o):main.c:(.text.startup+0xa7): undefined reference to `WinMain@16'
collect2.exe: error: ld returned 1 exit status