C++ stack, parameter passing and pointers-EEWORLD

Collect

//1. Pointer function

#include "stdafx.h"

void fun1(int a,int b)

{

printf("%d %d ",a,b);

}

int _tmain(int argc, _TCHAR* argv[])

{

void (*fun)(int x,int y); //void is the return value type of the function being pointed to, int is the parameter type of the function being pointed to

for=for1;

fun(10,20);

return 0;

}

2. Parameter passing

// 0224.cpp : Defines the entry point for the console application.

#include "stdafx.h"

int a=3;

int b=4;

void fun(int &x,int &y) // This is a reference transfer. That is, no new space is created in the stack, and the memory data of x and y are exchanged.

{//Note that the meaning of & here is not to get the address

int tem;

has=x;

x=y;

y=tem;

}

void fun1(int x, int y) // In this case, the value is passed, and two spaces x and y will be opened in the stack, which will exchange the values in the stack but will not affect the heap.

{

int tem;

has=x;

x=y;

y=tem;

}

void fun2(int *p1,int *p2)

{

int tem;

has=*p1;

*p1=*p2;

*p2=has;

}

int _tmain(int argc, _TCHAR* argv[])

{

fun(a,b);

printf("a=%d b=%d ",a,b);

fun1(a,b);

printf("a=%d b=%d ",a,b);

fun2(&a,&b); //Formal parameter is pointer, actual parameter is address

printf("a=%d b=%d ",a,b);

return 0;

}

Keywords：C++ Reference address：C++ stack, parameter passing and pointers

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