# C 程序：使用指針交換兩個數字 > 原文： [https://beginnersbook.com/2019/02/c-program-to-swap-two-numbers-using-pointers/](https://beginnersbook.com/2019/02/c-program-to-swap-two-numbers-using-pointers/) 在本教程中，我們將編寫一個 C 程序，使用指針交換兩個數字。我們已經涵蓋[如何在不使用指針](https://beginnersbook.com/2017/09/c-program-to-swap-two-numbers/)的情況下交換兩個數字。 ## 使用指針交換兩個數字的 C 示例 ```c /*C program by Chaitanya for beginnersbook.com * Program to swap two numbers using pointers*/ #include <stdio.h> // function to swap the two numbers void swap(int *x,int *y) { int t; t = *x; *x = *y; *y = t; } int main() { int num1,num2; printf("Enter value of num1: "); scanf("%d",&num1); printf("Enter value of num2: "); scanf("%d",&num2); //displaying numbers before swapping printf("Before Swapping: num1 is: %d, num2 is: %d\n",num1,num2); //calling the user defined function swap() swap(&num1,&num2); //displaying numbers after swapping printf("After Swapping: num1 is: %d, num2 is: %d\n",num1,num2); return 0; } ``` **輸出：**  #### 相關 C 示例 1. [C 程序：聲明，初始化和訪問指針](https://beginnersbook.com/2019/02/c-program-to-create-initialize-and-access-a-pointer-variable/) 2. [C 程序：檢查`char`是否為字母](https://beginnersbook.com/2017/09/c-program-to-check-whether-a-character-is-an-alphabet-or-not/) 3. [C 程序：將十進制轉換為八進制](https://beginnersbook.com/2017/09/c-program-to-convert-decimal-to-octal-number/) 4. [C 程序：查找商和余數](https://beginnersbook.com/2017/09/c-program-to-find-quotient-and-remainder/)