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Lỗi biên dịch:

Main.c:3:16: error: expected ‘;’, ‘,’ or ‘)’ before ‘&’ token
 void NhapN(int &n) {
                ^
Main.c: In function ‘main’:
Main.c:24:2: warning: implicit declaration of function ‘NhapN’; did you mean ‘NhapSo’? [-Wimplicit-function-declaration]
  NhapN(n);
  ^~~~~
  NhapSo
Main.c: In function ‘NhapSo’:
Main.c:9:3: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d", &d, &m);
   ^~~~~~~~~~~~~~~~~~~~~~