# C 程序：使用指針查找最大的三個數字 > 原文： [https://beginnersbook.com/2019/02/c-program-to-find-the-largest-of-three-numbers-using-pointers/](https://beginnersbook.com/2019/02/c-program-to-find-the-largest-of-three-numbers-using-pointers/) 在本教程中，我們將編寫一個 C 程序，使用指針查找三個輸入數字中最大的一個。 ## 使用指針查找最大數字的程序 在下面的程序中，我們有三個整數`num1`，`num2`，`num3`。我們已將這三個數字的地址分別賦給三個指針`p1`，`p2`，`p3`。之后我們使用[`if else`語句](https://beginnersbook.com/2014/01/c-if-statement/)對存儲在指針指向的地址處的值進行了比較。 ```c #include <stdio.h> int main() { int num1, num2, num3; int *p1, *p2, *p3; //taking input from user printf("Enter First Number: "); scanf("%d",&num1); printf("Enter Second Number: "); scanf("%d",&num2); printf("Enter Third Number: "); scanf("%d",&num3); //assigning the address of input numbers to pointers p1 = &num1; p2 = &num2; p3 = &num3; if(*p1 > *p2) { if(*p1 > *p3) { printf("%d is the largest number", *p1); } else { printf("%d is the largest number", *p3); } } else { if(*p2 > *p3) { printf("%d is the largest number", *p2); } else { printf("%d is the largest number", *p3); } } return 0; } ``` **輸出：**  #### 相關 C 示例 1. [C 程序：使用指針來統計字符串中的元音和輔音](https://beginnersbook.com/2019/02/c-program-to-count-vowels-and-consonants-in-a-string-using-pointer/) 2. [C 程序：使用指針打印字符串](https://beginnersbook.com/2019/02/c-program-to-print-string-using-pointer/) 3. [C 程序：使用指針交換兩個數字](https://beginnersbook.com/2019/02/c-program-to-swap-two-numbers-using-pointers/) 4. [C 程序：創建初始化并訪問指針變量](https://beginnersbook.com/2019/02/c-program-to-create-initialize-and-access-a-pointer-variable/) 5. [C 程序：查找最大的三個數字而不使用指針](https://beginnersbook.com/2014/06/c-program-to-find-greatest-of-three-numbers/)