c语言longlong double,C/C++中各种类型int、long long、double表示范围(最大最小值)

#include

#include

#include

using namespace std;

int main()

{

cout << "type: \t\t\t" << "************size**************"<< endl;

cout << "short: \t\t\t" << "字节数:" << sizeof(short) <

cout << "最大值:" << (numeric_limits::max)();

cout << "\t\t最小值:" << (numeric_limits::min)() << endl;

cout << "int: \t\t\t" << "字节数:" << sizeof(int) <

cout << "最大值:" << (numeric_limits::max)();

cout << "\t最小值:" << (numeric_limits::min)() << endl;

cout << "unsigned: \t\t" << "字节数:" << sizeof(unsigned) <

cout << "最大值:" << (numeric_limits::max)();

cout << "\t最小值:" << (numeric_limits::min)() << endl;

cout << "long: \t\t\t" << "字节数:" << sizeof(long) <

cout << "最大值:" << (numeric_limits::max)();

cout << "\t最小值:" << (numeric_limits::min)() << endl;

cout << "unsigned long: \t\t" << "字节数:" << sizeof(unsigned long) <

cout << "最大值:" << (numeric_limits::max)();

cout << "\t最小值:" << (numeric_limits::min)() << endl;

cout << "long long: \t\t" << "字节数:" << sizeof(long long) <

cout << "最大值:" << (numeric_limits::max)();

cout << "\t\t最小值:" << (numeric_limits::min)() << endl;

cout << "unsigned long long: \t" << "字节数:" << sizeof(unsigned long long) <

cout << "最大值:" << (numeric_limits::max)();

cout << "\t\t最小值:" << (numeric_limits::min)() << endl;

cout << "double: \t\t" << "字节数:" << sizeof(double) <

cout << "最大值:" << (numeric_limits::max)();

cout << "\t最小值:" << (numeric_limits::min)() << endl;

cout << "long double: \t\t" << "字节数:" << sizeof(long double) <

cout << "最大值:" << (numeric_limits::max)();

cout << "\t最小值:" << (numeric_limits::min)() << endl;

cout << "float: \t\t\t" << "字节数:" << sizeof(float) <

cout << "最大值:" << (numeric_limits::max)();

cout << "\t最小值:" << (numeric_limits::min)() << endl;

return 0;

}

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0818b9ca8b590ca3270a3433284dd417.png

### C语言中 `int`、`long int` `long long int` 的表示范围 在C语言中,不同类型具有不同的取值范围,具体取决于编译器操作系统架构。以下是关于这些类型的常见表示范围: #### `int` 通常情况下,`int` 类型占用4个字节,在大多数现代平台上其取值范围是从 -2,147,483,648 到 2,147,483,647 (即 \(-2^{31}\) 至 \(2^{31}-1\))[^1]。 ```cpp #include <limits.h> printf("Int range: %d to %d\n", INT_MIN, INT_MAX); ``` #### `long int` 对于 `long int` 类型来说,在32位系统上通常是4个字节,而在64位系统上则可能是8个字节。因此,在32位系统上的取值范围同样是 -2,147,483,648 到 2,147,483,647;但在64位系统上,该范围扩展到了从 -9,223,372,036,854,775,808 到 9,223,372,036,854,775,807 (即 \(-2^{63}\) 至 \(2^{63}-1\))[^2]。 ```cpp #include <limits.h> printf("Long Int range on 32-bit system: %ld to %lu\n", LONG_MIN, LONG_MAX); // For a 64-bit system the output would be different. ``` #### `long long int` `long long int` 是一种更宽泛的整数类型,它总是至少拥有64位宽度,并且无论是在32位还是64位环境中都保持一致的大小。这意味着它的最小负值为 -9,223,372,036,854,775,808 (-\(2^{63}\)) 并且最大正值可达 9,223,372,036,854,775,807 (\(2^{63}-1\))。 ```cpp #include <stdio.h> #include <limits.h> int main() { printf("Long Long Int range: %lld to %llu\n", LLONG_MIN, LLONG_MAX); } ``` 需要注意的是,确切的字节数数值界限可能会因具体的实现而异,所以建议使用预定义宏如 `INT_MIN`, `LLONG_MAX` 等来获取当前环境下的实际边界值。
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