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                # C++ 程序:在系統中查找`int`,`float`,`double`和`char`的大小 > 原文: [https://www.programiz.com/cpp-programming/examples/sizeof-operator](https://www.programiz.com/cpp-programming/examples/sizeof-operator) #### 他的程序聲明了 4 個類型為`int`,`float`,`double`和`char`的變量。 然后,使用`sizeof`運算符求值每個變量的大小。 要查找變量的大小,請使用`sizeof`運算符。 ```cpp sizeof(dataType); ``` * * * ## 示例:查找變量的大小 ```cpp #include <iostream> using namespace std; int main() { cout << "Size of char: " << sizeof(char) << " byte" << endl; cout << "Size of int: " << sizeof(int) << " bytes" << endl; cout << "Size of float: " << sizeof(float) << " bytes" << endl; cout << "Size of double: " << sizeof(double) << " bytes" << endl; return 0; } ``` **輸出** ```cpp Size of char: 1 byte Size of int: 4 bytes Size of float: 4 bytes Size of double: 8 bytes ``` **注意**:如果使用的是舊計算機,則可能會得到不同的結果。
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