c ++ basic knowledge

　　In C, & has several meanings
　　
　　1. When the two are connected together. &&. Represents the meaning of "和"
　　
　　For example, a == 1 && b == 2. It is when a = 1 and b = 2!
　　
　　2. Denote a reference, such as int a; int & ra = a; // define the reference ra, which is a reference to the variable a, namely the alias
　　
　　3, & represents two operators, one of which represents the value operator and one is Bitwise AND
　　
　　(3.1), value operator
　　
　　int a = 1;
　　
　　int * p = & a; // where & a means to take out the address in a, and then assign it to the pointer variable, which means & a means The address of variable a in memory. You can use the printf function to output this address
　　
　　(3.2), bitwise and operator
　　
　　calculation rules: if both numbers are true (or 1), the result is true, if one of the two digits is false (or 0) If the result is false
　　
　　such as a & b; means to perform binary bitwise AND operation of a and b
　　
　　such as 8 & 10, where the binary of 8 is 0000 1000, and the binary of 10 is 0000 1010, so
　　
　　0000 1000 (decimal 8)
　　
　　& 0000 1010 (decimal 10)
　　
　　results in 0000 1000 (that is, decimal 8)
　　
　　so 8 & 10 results in 8
　　
　　=================== <c ++ basic knowledge &> =======================================
　　
　　---------------------------------- <|| Operator from left to right, truncate judgment> --- -------------------------------------------------
　　
　　/ /coutTEst.cpp: defines the entry point of the console application.
　　
　　//
　　
　　#include "stdafx.h"
　　
　　#include "iostream"
　　
　　using namespace std;
　　
　　int _tmain (int argc, _TCHAR * argv [])
　　
　　{
　　
　　int a = 0;
　　
　　int b = 0;
　　
　　if (((a = 3) | | (b = 3)))
　　
　　{
　　
　　a ++;
　　
　　b ++;
　　
　　}
　　
　　cout << a << endl;
　　
　　cout << b << endl;
　　
　　return 0;
　　
　　}
　　
　　// The output result is 4, 1
　　
　　======== ================ <|| Operator from left to right, truncation judgment> ===================== ========
　　
　　------------------------------------------ <&& operator from left to right, all judged>
　　
　　// coutTEst.cpp: defines the entry point of the console application.
　　
　　//
　　
　　#include "stdafx.h"
　　
　　#include "iostream"
　　
　　using namespace std;
　　
　　int _tmain (int argc, _TCHAR * argv [])
　　
　　{
　　
　　int a = 0;
　　
　　int b = 0;
　　
　　if (((a = 3) && (b = 3)))
　　
　　{
　　
　　a ++;
　　
　　b ++;
　　
　　}
　　
　　cout << a << endl;
　　
　　cout << b << endl;
　　
　　return 0;
　　
　　}
　　
　　================= =========== <&& operator from left to right, all judgement> =========================== =========
　　
　　c ++ basic knowledge supplement, code fans, mamicode.com
　　
　　c ++ basic knowledge supplement