foo.c: In function 'main':
foo.c:8:3: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   if(ss(i)==1&&ss(n-i)==1)
   ^~
foo.c:10:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
    printf("\n");
    ^~~~~~
foo.c:7:14: warning: 'n' is used uninitialized in this function [-Wuninitialized]
  for(i=3;i<=n-i;i++)
             ~^~

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