/in/foo.cc: In function 'int main()':
/in/foo.cc:15:26: warning: format '%lld' expects argument of type 'long long int*', but argument 2 has type 'int*' [-Wformat=]
         scanf("%lld",&shu);
                          ^
/in/foo.cc:23:22: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'int' [-Wformat=]
     printf("%lld",sum);//输出
                      ^
/in/foo.cc:10:22: warning: unused variable 'sg' [-Wunused-variable]
     int shu,sum=0,cj,sg;//记得sum初始值赋为0；cj为其中一段运算（即一段连续的乘积）的值
                      ^~