调用函数(指针变量)对a,b值进行交换
/*↓此处a,b地址与main函数a,b地址不同,a,b仅仅在此函数内互相交换,main函数内a,b并没有交换*/void Swap_err1(int a,int b) {int tmp = a; a = b;b = tmp;}/*↓*tmp野指针,指针*tmp指向地址的值可能不允许被访问,程序崩溃*/void Swap_err2(int *p1,int *p2){int *tmp;*tmp = *p1;*p1 = *p2;*p2 = *tmp;}/*正解,通过对指针*p1,*p2进行解引用,借助整型变量tmp临时保存*/void Swap(int *p1,int *p2) {int tmp = *p1;*p1 = *p2;*p2 = tmp;}int main(){//交换a,b值int a = 10,b = 20;Swap(&a,&b); //通过地址解引用交换printf("a = %d,b = %d\n",a,b);return 0;}