/in/foo.c: In function 'hw':
/in/foo.c:50:15: warning: unused variable 'm' [-Wunused-variable]
     int i=0,j,m,k,sum=0;
               ^
/in/foo.c: In function 'zh':
/in/foo.c:79:11: warning: unused variable 'j' [-Wunused-variable]
     int i,j,c=0,d;
           ^
/in/foo.c: In function 'main':
/in/foo.c:62:9: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
        a=a/10;
        ~^~~~~
/in/foo.c:66:5: note: 'a' was declared here
 int pd(int a)
     ^~