对引用和指针使用以及函数返回引用和指针类型的理解

引用的符号是&，指针的符号是*

先来看看一段测试代码，

#include <iostream>

namespace std;

int globalJ =999;

   5:  

//返回值

int test1()

   8: {

int j =1;

<<&j<<endl;

  11:  

return j;

  13: }

  14:  

//使用局部变量，返回引用

int& test2()

  17: {

int j =998;

<<&j<<endl;

<<j<<endl;

  21:  

return j;

  23: }

  24:  

//使用全局变量，返回引用

int& test3()

  27: {

  28:     

<<&globalJ<<endl;

  30:     

return globalJ;

  32: }

  33:  

  34:  

//返回指针

int* test4()

  37: {

int j =998;

<<&j<<endl;

<<j<<endl;

  41:  

  42:  

return &j;  

  44: }

//返回指针

int* test5()

  47: {

<<&globalJ<<endl;

return &globalJ;  

  50: }

  51:  

  52:  

char* argv[])

  54: {

);

  56:     

int testresultvalue =0;

  58:     testresultvalue = test1();

<<&testresultvalue <<endl;

<<testresultvalue<<endl;

<<endl;

  62:  

  63:  

int & testResultReference  = test2();

<<&testResultReference <<endl;

<<testResultReference<<endl;

<<endl;

  68:  

  69:     testResultReference = test3();

<<&testResultReference <<endl;

<<testResultReference<<endl;

  72:     testResultReference = 4;

<<endl;

<<&testResultReference <<endl;

<<testResultReference<<endl;

  76:     

<<endl;

  78:  

int & testResultReference2 = test3();

<<&testResultReference2 <<endl;

<<testResultReference2<<endl;

<<endl;

  83:  

int* testResultPtr;

  85:     testResultPtr = test4();

<<testResultPtr <<endl;

<<*testResultPtr<<endl;

<<endl;

  89:     

  90:     testResultPtr = test5();

<<testResultPtr <<endl;

<<*testResultPtr<<endl;

<<endl;

  94:  

  95:  

  96:  

int temp;

  98:     cin>>temp;

  99:  

return 0;

 101: }

 102: