Main.cc: In function ‘int main()’: Main.cc:5:12: error: unable to find string literal operator ‘operator""a’ with ‘const char [41]’, ‘long unsigned int’ arguments printf("wo chu sheng zai %d,%d yue,wo %d sui le."a,b,c); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Main.cc:4:10: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&a,&b,&c); ~~~~~^~~~~~~~~~~~~~~~~~~~~