/in/foo.cc: In function 'void work()':
/in/foo.cc:41:14: warning: unused variable 'p' [-Wunused-variable]
    int i,j,k,p;
              ^
/in/foo.cc: In function 'void out()':
/in/foo.cc:57:10: warning: unused variable 'j' [-Wunused-variable]
    int i,j,k=0;
          ^
/in/foo.cc: At global scope:
/in/foo.cc:68:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:70:12: warning: unused variable 'j' [-Wunused-variable]
      int i,j,u,v,k;
            ^