如何在 C/C++ 中宣告指標變數?
指標用於儲存變數的地址。要在 C/C++ 中宣告指標變數,在變數名前使用星號 (*)。
宣告
*pointer_name
在 C 中
示例
#include <stdio.h>
int main() {
// A normal integer variable
int a = 7;
// A pointer variable that holds address of a.
int *p = &a;
// Value stored is value of variable "a"
printf("Value of Variable : %d\n", *p);
//it will print the address of the variable "a"
printf("Address of Variable : %p\n", p);
// reassign the value.
*p = 6;
printf("Value of the variable is now: %d\n", *p);
return 0;
}輸出
Value of Variable : 7 Address of Variable : 0x6ffe34 Value of the variable is now: 6
在 C++ 中
示例
#include <iostream>
using namespace std;
int main() {
// A normal integer variable
int a = 7;
// A pointer variable that holds address of a.
int *p = &a;
// Value stored is value of variable "a"
cout<<"Value of Variable : "<<*p<<endl;
//it will print the address of the variable "a"
cout<<"Address of Variable : "<<p<<endl;
// reassign the value.
*p = 6;
cout<<"Value of the variable is now: "<<*p<<endl;
return 0;
}輸出
Value of Variable : 7 Address of Variable : 0x6ffe34 Value of the variable is now: 6
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