C + + value types and reference type passing examples

Win32test.cpp: Defines the entry point of the console application. #include "stdafx.h" void swap_point (int * &a, int * &b) {int temp = *a; *a = *b;*b = temp;//Destroy caller pointer//a = NULL; b = NULL;p rintf ("swap_point:[0x%x", [0x%x] \ r \ n ", &a, &b);} void Swap (int * A, int * b) {int temp = *a; *a = *b;*b = temp;//Destroy caller pointer invalid//a = NULL;//b = null;p rintf ("swap:[0x%x], [ 0x%x] \ r \ n ", &a, &b);} void swap (int & A, int & b) {int temp = A; a = b; b = temp;p rintf ("swap:[0x%x], [0x%x] \ r \ n", &a, &b) ;} int _tmain (int argc, _tchar* argv[]) {/*int *ptr[3];for (int i = 0; i < 3; i++) {Ptr[i] = new int[5]; for (int l = 0; l < 5; l++) {Ptr[i][l] = i * l;p rintf ("%d *%d =%d \ r \ n", I, L, Ptr[i][l]);}}  *//*int (*PTR) [3];p tr = (int (*) [3]) malloc (sizeof (int *) * 5); for (int i = 0; i < 5; i++) {(*ptr) [0] = 1; (*ptr) [1] = 2; (*ptr) [2] = 3;ptr++;} The initial y[9][9 Array char = {0};*/int a = 3; int b = 4;//The pointer is passed by value (cannot modify the value of the caller pointer variable), call swap, pointer variable Ptra, PTRB is passed by "value", where swap in T * A, int * b Copy Ptra, PTRB pointer variable int * Ptra = &a; int * ptrb = &b; Swap (Ptra, PTRB);p rintf ("a =%d [0x%x], B =%d[0x%x ], Ptra = [0x%x], PTRB = [0x%x] \ r \ n ", A, &a, B, &b, &ptra, &AMP;PTRB);//pointer passed by reference (can modify the value of the caller pointer variable), call SW Ap_point, pointer variable Ptra, PTRB is passed by "reference", where swap is int * A, int * b is ptra, PTRB pointer variable swap_point (PTRA, PTRB);p rintf ("a = %d [0x%x], B =%d[0x%x], Ptra = [0x%x], PTRB = [0x%x] \ r \ n ", A, &a, B, &b, &ptra, &AMP;PTRB);//By reference Pass a = 3; b = 4; swap (A, b);p rintf ("a =%d [0x%x], b =%d[0x%x] \ r \ n", A, &a, B, &b); System ("pause"); return 0;}

C + + value types and reference type passing examples