long long int

Long long int is a data type in programming languages that can hold larger integer values than the regular int data type. It is typically used to store 64-bit integers, which can range from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807. The "long long" part of the name refers to the fact that it is a longer integer type than the regular int. In C and C++, the keyword for long long int is "long long", and in Java and other languages, it is "long".

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Long long int

Long long int is a data type used in programming languages such as C++ and Java. It is a larger version of the standard int data type, capable of storing larger values. Specifically, a long long int is an integer data type that can store values between -9,223,372,036,854,775,808 and 9,223,372,036,854,775,807 (inclusive) in 64 bits of memory. This makes it useful for calculations that involve very large numbers, such as in cryptography or scientific computations.

long long int用法

`long long int` 是 C++ 中一种数据类型，用于存储整数类型的数据。它可以存储比 `int` 更大的整数，通常在需要大整数计算时使用。

使用 `long long int` 的方法与使用 `int` 类型类似，只需要在定义变量时在类型前加上 `long long` 修饰符即可。例如：

long long int a = 1234567890123456789LL;

需要注意的是，`long long int` 在不同的编译器中可能占用的字节数不同，但至少要占用 8 个字节（64 位），因此通常可以存储 -9,223,372,036,854,775,808 到 9,223,372,036,854,775,807 之间的整数。

在进行运算时，如果两个操作数都是 `long long int` 类型，则运算结果也是 `long long int` 类型。如果其中一个操作数是 `int` 类型，则需要使用强制类型转换将 `int` 类型转换为 `long long int` 类型，避免出现精度损失。例如：

int b = 123456789;
long long int c = 987654321;
long long int d = b * c; // 错误，b 会先被转换为 long long int，但精度已经损失了
long long int e = (long long int)b * c; // 正确，将 b 强制转换为 long long int