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                # C 程序:`long`關鍵字演示 > 原文: [https://www.programiz.com/c-programming/examples/keyword-long](https://www.programiz.com/c-programming/examples/keyword-long) #### 在此示例中,您將學習演示`long`關鍵字的工作原理。 要理解此示例,您應該了解以下 [C 編程](/c-programming "C tutorial")主題: * [C 數據類型](/c-programming/c-data-types) * [C 變量,常量和字面值](/c-programming/c-variables-constants) * [C 輸入輸出(I/O)](/c-programming/c-input-output) * * * ## 使用`long`關鍵字編程 ```c #include <stdio.h> int main() { int a; long b; // equivalent to long int b; long long c; // equivalent to long long int c; double e; long double f; printf("Size of int = %zu bytes \n", sizeof(a)); printf("Size of long int = %zu bytes\n", sizeof(b)); printf("Size of long long int = %zu bytes\n", sizeof(c)); printf("Size of double = %zu bytes\n", sizeof(e)); printf("Size of long double = %zu bytes\n", sizeof(f)); return 0; } ``` **輸出** ```c Size of int = 4 bytes Size of long int = 8 bytes Size of long long int = 8 bytes Size of double = 8 bytes Size of long double = 16 bytes ``` * * * 在此程序中,`sizeof`運算符用于查找`int`,`long`,`long long`,`double`和`long double`變量的大小。 如您所見,`long int`和`long double`變量的大小分別大于`int`和`double`變量。 順便說一下,`sizeof`運算符返回`size_t`(無符號整數類型)。 `size_t`數據類型用于表示對象的大小。 用于`size_t`的格式說明符是`%zu`。 **注意**:不能將`long`關鍵字與`float`和`char`類型一起使用。
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