enter image description here

This the the visual of the problem. Please help!!

Tried fixing from yt videos but they suggest to save the file before execution .I did but it keeps failing.

“c:/mingw/bin/../lib/gcc/mingw32/6.3.0/../../../libmingw32.a(main.o):(.text.startup+0xa0): undefined reference to `WinMain@16′
collect2.exe: error: ld returned 1 exit status”

This is what the terminal shows me.