C/C++程序设计与算法第八周：指针与数组

指针作为函数参数，真正的交换两个数字

 #include
using namespace std;
void swap(int *p1,int *p2){
    int swap = *p1;
	*p1 = *p2;
	*p2 = swap;
}
int main(){
   int a = 1,b = 2;
   cout<< a <<" "<< b <<endl;
   swap(&a,&b);
   cout<< "交换后结果："<<endl;
   cout<< a << " "<< b<<endl;
   return 0;
}

用指针使数组逆序

 #include
using namespace std;
void reverse(int *p,int L){
   for(int i = 0;i< L/2;i++){
      int temp = p[i];
	  p[i] = p[L - i - 1];
	  p[L - i -1] = temp;
   }
}

int main(){
  int a[5] = {1,2,3,4,5};
  reverse(a,sizeof(a)/sizeof(int));
  for(int i = 0;i< sizeof(a)/sizeof(int);i++)
    cout<< *(a + i)<<" ";
  cout<<endl;
  return 0;
}