"The last program I wrote was a Sudoku solver in C++ several years ago, so I’m out of date," he said. "My children are in IT, two of them—both graduated from MIT. One of them browsed a book ...

Both experts said that the source code is in C, as opposed to the C++ PM Lee had said the code was in. Explaining why PM Lee could have said it was written in C++, Mr Tan said: "It is not wrong to ...