Date:
2014-1-9

Summary:

函式引數相關記錄

Contents:
1.形參實參

形參:用於接收值的變數被稱為形參

實參:傳遞給函式的值被稱為實參

2.函式的引數傳遞之後2種

a).值傳遞.將實參的值拷貝之後，傳遞給形參（如果是指標，則拷貝指標的值，傳遞給形參）

b).引用傳遞.如果形參是引用，則形參被繫結到了對應的實參上

Notes:

1.使用引用作為形參，儘量避免拷貝

2.函式引數，非引用傳遞，則為拷貝值傳遞

EX:

     //

     //  main.cpp

     //  Cpp_All_Test

     //

     //  Created by StephenLee on 1/1/14.

     //  Copyright (c) 2014 StephenLee. All rights reserved.

     //

 void mySwap(int* pNum1,int* pNum2)

 {

     int temp = (*pNum1);

     (*pNum1) = (*pNum2);

     (*pNum2) = temp;

 }

 void mySwap(int& num1,int& num2)

 {

     int temp = num1;

     num1 = num2;

     num2 = temp;

 }

     int nNum1 = ;

     int nNum2 = ;

     cout << "nNum1:" << nNum1 << "\nnNum2:" << nNum2 << endl;

     mySwap(&nNum1,&nNum2);

     cout << "after mySwap \nnNum1:" << nNum1 << "\nnNum2:" << nNum2 << endl;

     mySwap(nNum1,nNum2);

     cout << "after mySwap \nnNum1:" << nNum1 << "\nnNum2:" << nNum2 << endl;

THE END