举例说明:
[code]#include using namespace std;void swapv(int a, int b) // 传变量的值{ int temp = a; a = b; b = temp;}void swapp(int *a, int *b) // 传变量的地址{ int temp = *a; *a = *b; *b= temp;}void swapq(int & a, int & b) // 传引用变量{ int temp = a; a = b; b = temp;}int main(void){ int wallet1 = 120; int wallet2 = 50; cout