4.4 Expressions

• All binary and ternary operators MUST be padded on the left and right by one space, including assignment operators.
• Prefix and suffix operators MUST NOT be padded, neither on the left nor on the right.
• When necessary, padding is done with a single whitespace.
• The ., ->, ::, operator[] and operator() operators MUST NOT be padded.

  This is wrong: x+=10*++x; y=a?b:c;

  This is correct: x += 10 * ++x; y = a ? b : c;

• In C++ you SHOULD write 0 instead of NULL for NULL pointers.
• There MUST be a space between the function name arguments.

            int
            foo (int n)
            {
              return bar () + n;
            }
       

• Expressions MAY span over multiple lines. When a line break occurs within an expression, it MUST appear just before a binary operator, in which case the binary operator MUST be indented with at least an extra indentation level.

            std::cout << "Hello!" << std::endl
              << "World!\n" << std::endl;