/in/foo.cc: In function 'int main()':
/in/foo.cc:4:22: error: 'scanf' was not declared in this scope
  scanf("%d%d%d",a,b,c);
                      ^
/in/foo.cc:7:36: error: 'printf' was not declared in this scope
          printf("%d%d%d\n",&a,&b,&c);  
                                    ^
/in/foo.cc:10:39: error: 'printf' was not declared in this scope
             printf("%d%d%d\n",&a,&c,&b);
                                       ^
/in/foo.cc:12:33: error: 'printf' was not declared in this scope
       printf("%d%d%d\n",&a,&b,&c);  
                                 ^
/in/foo.cc:15:38: error: 'printf' was not declared in this scope
            printf("%d%d%d\n",&b,&a,&c);  
                                      ^
/in/foo.cc:18:41: error: 'printf' was not declared in this scope
               printf("%d%d%d\n",&a,&b,&c);
                                         ^
/in/foo.cc:20:33: error: 'printf' was not declared in this scope
       printf("%d%d%d\n",&c,&b,&a);  
                                 ^
/in/foo.cc:21:13: error: expected '}' at end of input
     return 0;
             ^