(黑马程序员匠心之作|C++教程从0到1入门编程写---指针和函数练习

#include
using namespace std;
void swap01(char a, char b） //值传递
{
char temp;
temp = a;
a = b;
b = temp;
cout << “swap01 a=” << a << endl;
cout << “swap01 b=” << b << endl;
}
void swap02(char * p1, char *p2) //地址传递
{
char temp=*p1;
*p1 = *p2;
*p2 = temp;
cout << “swap02 a=” << *p1 << endl;
cout << “swap02 b=” << *p2 << endl;
}
int main()
{
char a = ‘a’;
char b = ‘b’;
swap01(a, b);
cout << “swap01交换后a=” << a << endl;
cout << “swap01交换后b=” << b << endl;
swap02(&a, &b);
cout << “swap02交换后a=” << a << endl;
cout << “swap02交换后b=” << b << endl;
system(“pause”);
return 0;
}

*注意：通过值传递的方式，不能通过形参来改变实参的值。
如下图所示
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