/in/foo.c: In function 'quzhi':
/in/foo.c:4:9: warning: unused variable 'c' [-Wunused-variable]
 int a,b,c;
         ^
/in/foo.c:4:7: warning: unused variable 'b' [-Wunused-variable]
 int a,b,c;
       ^
/in/foo.c:16:6: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized]
   a=a*10+ch-'0';
      ^
/in/foo.c: In function 'main':
/in/foo.c:33:7: warning: iteration 100u invokes undefined behavior [-Waggressive-loop-optimizations]
   if(b[i]>0)
       ^
/in/foo.c:31:2: note: containing loop
  for(i=0;i<=200;i++)
  ^