/in/foo.c: In function 'add':
/in/foo.c:38:11: warning: unused variable 'flag' [-Wunused-variable]
     int i,flag=0,c=0;//c表示进制，先没有进位
           ^~~~
/in/foo.c: In function 'main':
/in/foo.c:60:15: warning: format '%s' expects argument of type 'char *', but argument 3 has type 'char (*)[1000000]' [-Wformat=]
     scanf("%d%s",&n,&m);
               ^
/in/foo.c:58:9: warning: unused variable 'i' [-Wunused-variable]
     int i=0;
         ^
/in/foo.c: In function 'trans':
/in/foo.c:23:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^