foo.cpp:1:1: error: 'include' does not name a type
 include <iostream> include <cstdio> include <cstring> 
 ^
foo.cpp: In function 'int main()':
foo.cpp:9:14: error: 'scanf' was not declared in this scope
 scanf("%d",&n);
              ^
foo.cpp:10:18: error: 'sprintf' was not declared in this scope
 sprintf(st,"%d",n);
                  ^
foo.cpp:11:14: error: 'strlen' was not declared in this scope
 len=strlen(st);
              ^
foo.cpp:12:27: error: 'printf' was not declared in this scope
 if (st[0]=='-') printf("-");
                           ^
foo.cpp:16:20: error: 'printf' was not declared in this scope
 printf("%c",st[len]);
                    ^
foo.cpp:18:28: error: 'printf' was not declared in this scope
 if (st[0]=='-') printf("\n");
                            ^
foo.cpp:19:25: error: 'printf' was not declared in this scope
 else printf("%c\n",st[0]);
                         ^