# C 程序：查找`int`，`float`，`double`和`char`的大小 > 原文： [https://beginnersbook.com/2017/09/c-program-to-find-the-size-of-int-float-double-andchar_](https://beginnersbook.com/2017/09/c-program-to-find-the-size-of-int-float-double-and-char/) 該程序查找數據類型的大小，如`char`，`int`，`float`，`double`。 ## 示例：用于在 C 中查找數據類型大小的程序 在這個程序中，我們使用`sizeof()`運算符來查找數據類型的大小。當`sizeof` 與原始數據類型（如`int`，`float`，`double`和`char`）一起使用時，它將返回分配給它們的內存量。 ```c #include<stdio.h> int main() { printf("Size of char: %ld byte\n",sizeof(char)); printf("Size of int: %ld bytes\n",sizeof(int)); printf("Size of float: %ld bytes\n",sizeof(float)); printf("Size of double: %ld bytes", sizeof(double)); return 0; } ``` 輸出： ```c Size of char: 1 byte Size of int: 4 bytes Size of float: 4 bytes Size of double: 8 bytes ``` 看看這些相關的 C 程序： 1. [C 程序：相加兩個數字](https://beginnersbook.com/2017/09/c-program-to-add-two-numbers/) 2. [C 程序：查找數組中的元素數](https://beginnersbook.com/2017/09/c-program-to-find-the-number-of-elements-in-an-array/) 3. [C 程序：檢查數字是正數還是負數](https://beginnersbook.com/2015/02/c-program-to-check-whether-the-given-integer-is-positive-or-negative/) 4. [C 程序：按升序排列數字](https://beginnersbook.com/2015/02/c-program-to-arrange-numbers-in-ascending-order/) 5. [C 程序：查找商和余數](https://beginnersbook.com/2017/09/c-program-to-find-quotient-and-remainder/)