foo.cc: In function 'int main()':
foo.cc:13:2: error: 'a' was not declared in this scope
  a=a+a*b/100
  ^
foo.cc:13:8: error: 'b' was not declared in this scope
  a=a+a*b/100
        ^

自豪的采用jd5进行评测(github.com/masnn/jd5)