小白的C++问题集（lab1）

被Курочкин折腾的死去活来之后，我终于决定把他的问题总结一下发上来，权当记录自己的血泪。

本文没什么干货，只是一些新手（可能只有我吧QAQ）容易忽视的问题。

1.

char cByte = -12; // cByte == 0x ?    

2.

int iInt = 0xABCDEF98;
unsigned short dd = iInt;// dd == 0x ?
iInt = dd;//iInt == 0x?

short tt = iInt; // tt == 0x?
iInt = tt; //iInt == 0x?

unsigned int aInt = 0xABCDEF98; 
short ff = aInt; // ff == 0x?
aInt = ff; // aInt == 0x?

unsigned short gg = aInt; // gg == 0x?
aInt = gg; // aInt == 0x?

3.

float fFloat = 4.2533333f;  
double dDouble = 4.2533333; 

if (fFloat == dDouble)
    dDouble = 999;

stop // dDouble == ?

4.

iInt=1;
double dDouble1=iInt/3.f;
double dDouble2=iInt/3.;
double dDouble3=(float)iInt/ 3;

if (dDouble1 == dDouble2)
    dDouble1 = 55;

stop // dDouble1 == ?

iInt=1;
double dDouble1=iInt/2.f;
double dDouble2=iInt/2.;
double dDouble3=(float)iInt/ 2; 

if (dDouble1 == dDouble2)
    dDouble1 = 55;

stop // dDouble1 == ?

5.

#include   
int nTwin=1; 
namespace TwinSpace{ int nTwin=2;}
main()
{

    nTwin=100;
    TwinSpace::nTwin = 300;
    nTwin++;
    int nTwin;
    nTwin=200;  
    ::nTwin++;  
    {
 int nTwin;
 nTwin=-1;
 {int nTwin = 88;
     {
  nTwin = 99;
     }
 ::nTwin = 44;
     {
     ::nTwin = 91;
     }
 }
 stop // nTwin == ?   ::nTwin == ?
 ::nTwin++;
 TwinSpace::nTwin++;
    }

    nTwin--;
}

6.

for (int i=0; i<3; i++)
    {
 static int nStatic1 = 100;//
 int nLocal1 = 100;
 int nLocal2 = i++;
 static int nStatic2 = ++nStatic1 * (++i);
 nStatic1++;
 nStatic2++;
 nLocal1++;
 stop // i ==  ?
    }

请问总共循环几次，以及全部循环结束后每个值等于多少？

7.

enum eColors
    {
 BLACK,
 BLUE,
 GREEN,
 RED=5,
 YELLOW,
 WHITE=RED+4
    };
int nnn = BLACK;
nnn = BLUE | YELLOW;// nnn == ？
nnn = BLUE + YELLOW;// nnn == ？
nnn = 1 | 6 & BLACK;// nnn == ？