/in/foo.cc:13:6: error: stray '\357' in program
   b++；
      ^
/in/foo.cc:13:7: error: stray '\274' in program
   b++；
       ^
/in/foo.cc:13:8: error: stray '\233' in program
   b++；
        ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:12:14: error: lvalue required as left operand of assignment
   if(a[i]%10=2)
              ^
/in/foo.cc:14:2: error: expected ';' before '}' token
  }
  ^
/in/foo.cc:15:8: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
 if(a[i]=20)
    ~~~~^~~