C ++ expressions and statements

Operator priority

The operators in each interval have the same priority, and the operators in the preceding interval have a higher priority.

 

The unary operator and the value assignment operator combine the right operator, while other operators combine the left operator. For example, a = B = C means a = (B = C), A + B + C is (a + B) + C

 

Overflow, overflow, and division by zero will not throw a standard exception

 

In an expression, the order in which subexpressions are evaluated is not defined. You cannot evaluate an expression from left to right. For example:

Int X = F (2) + G (3); // no definition of F () or G () which calls first

Int I = 1;

V [I] = I ++; // The result is not defined.

 

Void CPY (char * P, char * q)

{

While (* P ++ = * q ++ );

}

 

The delete operator can only use the pointer or 0 returned by new, and will not affect the 0 application.

 

Pointer conversion cannot be expressed directly in the T (e) notation. For example, char * (2) is a syntax error.

 

Int J = int (); // default int Value

Complex z = complex (); // default Complex Value