[C++] Call by Value/Call by Pointer/Call by Reference的範例
1. Call by Valueint main(){
int a = 1;
int b = a;
return 0;
}2. Call by Pointervoid swap(int *address_a, int *address_b) {
int temp = *address_a ;
*address_a = *address_b;
*address_b = temp;
}
int main() {
int a = 1;
int b = 0;
swap(&a, &b); // 傳入a, b的address進行交換
return 0;
}3. Call by Referencevoid swap(int &address_a, int &address_b) {
int temp = address_a ;
address_a = address_b;
address_b = temp;
}
int main() {
int a = 1;
int b = 0;
swap(a, b); // 傳入a, b的address進行交換
return 0;
}使用Call by Pointer跟Call by Reference傳遞參數給函式會實質變更變數數值！
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