Mã chấm: 269475

Main.cc: In function ‘int main()’:
Main.cc:10:18: error: expected primary-expression before ‘=’ token
     int signal = = -1;
                  ^
Main.cc:6:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lf", &c);
     ~~~~~^~~~~~~~~~~