/in/foo.cc:3:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:6:2: error: expected initializer before 'a'
  a=a*0.2;
  ^
/in/foo.cc:8:2: error: 'c' was not declared in this scope
  c=c*0.5;
  ^
/in/foo.cc:9:15: error: expected primary-expression before ';' token
  cout<<a+b+c<<;
               ^
/in/foo.cc:10:15: error: expected primary-expression before ';' token
  cout>>a+b+c>>;
               ^