//关于函数赋值
void fun1(int num1,int num2)
{
cout<<"fun1():"<"num1="<" "<<"num2="<int temp=num1;
num1=num2;
num2=temp;
cout<<"num1="<" "<<"num2="<int *p1,int *p2)
{
cout<<"fun2():"<"*p1="<<*p1<<" "<<"*p2="<<*p2<int * pt=p1;
p1=p2;
p2=pt;
cout<<"*p1="<<*p1<<" "<<"*p2="<<*p2<int *p1,int *p2)
{
cout<<"fun2():"<"*p1="<<*p1<<" "<<"*p2="<<*p2<int temp=*p1;
*p1=*p2;
*p2=temp;
cout<<"*p1="<<*p1<<" "<<"*p2="<<*p2<*编译成功但是程序存在问题，p指针指向的内存空间没有被释放（因为在堆空间中）
要释放free(p)。*/
void mem1()
{
char * p=(char *)malloc(20);
strcpy(p,"hello");
printf("*p=%s\n",p);
//cout<<*p;只输出h
free(p);
}
void main()
{
int a=10,b=20;
// fun1(a,b);
// cout<<"执行fun1()"<<"a="<" "<<"b="<// fun2(&a,&b);
// cout<<"执行fun2()"<<"a="<" "<<"b="<// fun3(&a,&b);
// cout<<"执行fun3()"<<"a="<" "<<"b="<
