/in/foo.c: In function 'main':
/in/foo.c:16:32: warning: unknown conversion type character 0xffffffe7 in format [-Wformat=]
         printf("结果为：%11的、你", sum);
                                ^
/in/foo.c:16:16: warning: too many arguments for format [-Wformat-extra-args]
         printf("结果为：%11的、你", sum);
                ^~~~~~~~~~~~~~~~~~~~~~~~~~