Long long int
时间: 2023-11-18 14:05:43 浏览: 29
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.
相关问题
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".
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:
```cpp
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:
```cpp
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
```