/in/foo.c: In function 'hw':
/in/foo.c:32:15: warning: unused variable 'm' [-Wunused-variable]
     int i=0,j,m,k,sum=0;
               ^
/in/foo.c: In function 'zh':
/in/foo.c:61:11: warning: unused variable 'j' [-Wunused-variable]
     int i,j,c=0,d;
           ^