/in/foo.c: In function 'main':
/in/foo.c:8:8: warning: implicit declaration of function 'su' [-Wimplicit-function-declaration]
   kang=su(j);
        ^~
/in/foo.c: In function 'su':
/in/foo.c:17:8: warning: unused variable 'ge' [-Wunused-variable]
  int i,ge,pu;
        ^~