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Lỗi biên dịch:

Main.c: In function ‘doc’:
Main.c:3:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ at end of input
 int main()
 ^~~
Main.c:3:1: warning: control reaches end of non-void function [-Wreturn-type]
 int main()
 ^~~