Mã chấm: 268817

Main.cc: In function ‘int main()’:
Main.cc:13:18: error: invalid conversion from ‘int’ to ‘const char*’ [-fpermissive]
  printf(tong_tien);
                  ^
In file included from /usr/include/stdio.h:862:0,
                 from Main.cc:1:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:102:1: note:   initializing argument 1 of ‘int printf(const char*, ...)’
 printf (const char *__restrict __fmt, ...)
 ^~~~~~
Main.cc:13:18: warning: format not a string literal and no format arguments [-Wformat-security]
  printf(tong_tien);
                  ^