C++ 中的数据类型范围及其宏
c++server side programmingprogramming
在某些情况下，我们需要在不同的问题中使用特定数据类型的最小值或最大值。记住该值非常困难。因此，C++ 有一些宏，用于表示某些数据类型的最小值和最大值范围。其中一些没有宏，因为它们是无符号的，因此最小值将为 0。
| 数据类型 | 范围 | 最小值宏 | 最大值宏 |
|---|---|---|---|
| char | -128 to +127 | CHAR_MIN | CHAR_MAX |
| short char | -128 to +127 | SCHAR_MIN | SCHAR_MAX |
| unsigned char | 0 to 255 | ----- | UCHAR_MAX |
| short int | -32768 to +32767 | SHRT_MIN | SHRT_MAX |
| unsigned short int | 0 to 65535 | ----- | USHRT_MAX |
| int | -2147483648 to +2147483647 | INT_MIN | INT_MAX |
| unsigned int | 0 to 4294967295 | ----- | INT_MAX |
| long int | -2147483648 to +2147483647 | LONG_MIN | LONG_MAX |
| unsigned long int | 0 to 18446744073709551615 | ----- | ULONG_MAX |
| long long int | -9223372036854775808 to +9223372036854775807 | LLONG_MIN | LLONG_MAX |
| unsigned long long int | 0 to 18446744073709551615 | ----- | ULLONG_MAX |
| float | 1.17549e-38 to 3.40282e+38 | FLT_MIN | FLT_MAX |
| float(negative) | -1.17549e-38 to -3.40282e+38 | -FLT_MIN | -FLT_MAX |
| double | 2.22507e-308 to 1.79769e+308 | DBL_MIN | DBL_MAX |
| double(negative) | -2.22507e-308 to -1.79769e+308 | -DBL_MIN | -DBL_MAX |
我们可以看到一个简单的程序，用于打印 C++ 某些数据类型的范围。
示例
#include<iostream>
#include<limits.h> // 用于 int、char 宏
#include<float.h> // 用于 float、double 宏
using namespace std;
int main() {
cout << "char Range: (" << CHAR_MIN <<", " <<CHAR_MAX << ")\n";
cout << "short char Range: (" << SCHAR_MIN <<", " <<SCHAR_MAX << ")\n";
cout << "unsigned char Range: (" << 0 <<", " <<UCHAR_MAX << ")\n";
cout << "short int Range: (" << SHRT_MIN <<", " <<SHRT_MAX << ")\n";
cout << "unsigned short int Range: (" << 0 <<", " <<USHRT_MAX << ")\n";
cout << "int Range: (" << INT_MIN <<", " <<INT_MAX << ")\n";
cout << "unsigned int Range: (" << 0 <<", " <<UINT_MAX << ")\n";
cout << "long int Range: (" << LONG_MIN <<", " <<LONG_MAX << ")\n";
cout << "unsigned long int Range: (" << 0 <<", " <<ULONG_MAX << ")\n";
cout << "long long int Range: (" << LLONG_MIN <<", " <<LLONG_MAX << ")\n";
cout << "unsigned long long int Range: (" << 0 <<", " <<ULLONG_MAX << ")\n";
cout << "float Range: (" << FLT_MIN <<", " <<FLT_MAX << ")\n";
cout << "float(negative) Range: (" << -FLT_MIN <<", " <<-FLT_MAX << ")\n";
cout << "double Range: (" << DBL_MIN <<", " <<DBL_MAX << ")\n";
cout << "double(negative) Range: (" << -DBL_MIN <<", " <<-DBL_MAX << ")";
}
输出
char Range: (-128, 127) short char Range: (-128, 127) unsigned char Range: (0, 255) short int Range: (-32768, 32767) unsigned short int Range: (0, 65535) int Range: (-2147483648, 2147483647) unsigned int Range: (0, 4294967295) long int Range: (-2147483648, 2147483647) unsigned long int Range: (0, 4294967295) long long int Range: (-9223372036854775808, 9223372036854775807) unsigned long long int Range: (0, 18446744073709551615) float Range: (1.17549e-038, 3.40282e+038) float(negative) Range: (-1.17549e-038, -3.40282e+038) double Range: (2.22507e-308, 1.79769e+308) double(negative) Range: (-2.22507e-308, -1.79769e+308)
