2)传地址调用 void swap(int*x, int*y) a b Int temp; 510 temp=*X Fy= temp void main() int a=10.b=5 cout<< Before swap a=><<a<< b=><<b<<endl swap(&a, &b); cout<< After swap a =><<a<< b=><<b<<endl2)传地址调用 void swap(int* x, int* y) { int a = 10, b = 5; int temp; void main( ) temp = *x; *x = *y; *y = temp; } { cout<<“Before swap a = ”<<a<<“,b = ”<<b<<endl; cout<<“After swap a = ”<<a<<“,b = ”<<b<<endl; swap(&a, &b); } 10 5 a b x y 5 10