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                # C 程序:查找數組中的元素數 > 原文: [https://beginnersbook.com/2017/09/c-program-to-find-the-number-of-elements-in-an-array/](https://beginnersbook.com/2017/09/c-program-to-find-the-number-of-elements-in-an-array/) 這里我們將編寫一個 C 程序來查找給定數組中的元素數。 ## 示例:用于查找數組大小的程序 我們用于查找元素數量的程序,對于所有類型的數組都是通用的。在這個例子中,我們有一個`double`數據類型的數組,但是你可以對其他數據類型的數組使用相同的邏輯,如:`int`,`float`,`long`,`char`等。 ```c #include <stdio.h> int main() { double arr[] = {11, 22, 33, 44, 55, 66}; int n; /* Calculating the size of the array with this formula. * n = sizeof(array_name) / sizeof(array_name[0]) * This is a universal formula to find number of elements in * an array, which means it will work for arrays of all data * types such as int, char, float etc. */ n = sizeof(arr) / sizeof(arr[0]); printf("Size of the array is: %d\n", n); return 0; } 輸出: ``` ```c Size of the array is: 6 ``` 查看相關的 [C 程序](https://beginnersbook.com/2015/02/simple-c-programs/): 1. [C 程序:查找數組的最大元素](https://beginnersbook.com/2015/02/c-program-to-find-largest-element-of-an-array/) 2. [C 程序:查找數組元素之和](https://beginnersbook.com/2014/06/c-program-to-find-sum-of-array-elements-using-pointers-recursion-functions/) 3. [C 程序:顯示用戶輸入的數字](https://beginnersbook.com/2017/09/c-program-to-print-an-integer-entered-by-a-user/) 4. [C 程序:檢查數字是否是回文](https://beginnersbook.com/2015/02/c-program-to-check-if-a-number-is-palindrome-or-not/)
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