C++快速入門---傳值、傳值和傳引用（6）
阿新 • • 發佈：2018-11-03
C++快速入門---傳值、傳值和傳引用（6）
傳值
#include <iostream> void changeAge(int age, int newAge); // 如果想要實現計劃功能，需要怎麼改？ main() { int age = 24; std::cout << "My age is " << age << "\n"; changeAge(age, age+1); std::cout << "Now my age is " << age << "\n"; } void changeAge (int age, int newAge) { age = newAge; std::cout << "In this , my age is " << age << "\n"; }
傳地址
#include <iostream> void changeAge(int *age, int newAge); // 如果想要實現計劃功能，需要怎麼改？ main() { int age = 24; std::cout << "My age is " << age << "\n"; changeAge(&age, age+1); std::cout << "Now my age is " << age << "\n"; } void changeAge (int *age, int newAge) { *age = newAge; std::cout << "In this , my age is " << *age << "\n"; }
交換：
#include <iostream> void swap(int *x, int *y); main() { int x, y; std::cout << "請輸入兩個不同的值："; std::cin >> x >> y; swap(&x, &y); std::cout << "調換後輸出：" << x << ' ' << y << "\n\n"; } void swap(int *x, int *y) { int temp; temp = *x; *x = *y; *y = temp; }
另一種交換方式：
#include <iostream>
void swap(int *x, int *y);
main()
{
int x, y;
std::cout << "請輸入兩個不同的值：";
std::cin >> x >> y;
swap(&x, &y);
std::cout << "調換後輸出：" << x << ' ' << y << "\n\n";
}
void swap(int *x, int *y)
{
*x = *x + *y;
*y = *x - *y;
*x = *x - *y;
}另一種交換方式：
#include <iostream>
void swap(int *x, int *y);
main()
{
int x, y;
std::cout << "請輸入兩個不同的值：";
std::cin >> x >> y;
swap(&x, &y);
std::cout << "調換後輸出：" << x << ' ' << y << "\n\n";
}
void swap(int *x, int *y)
{
*x ^= *y;
*y ^= *x;
*x ^= *y;
}