std :: numeric_limits :: max() :
std :: numeric_limits
头文件:
#include
模板:
static T max() throw();
static constexpr T max() noexcept;
句法:
std::numeric_limits::max
参数:它接收任何一种数据类型,即T。
返回类型:根据类型T,它返回预定义的宏,是true还是默认T()。一些标准返回值是:
Type T | std::numeric_limits |
---|---|
/* non-specialized */ | T() |
bool | TRUE |
char | CHAR_MAX |
signed char | SCHAR_MAX |
unsigned char | UCHAR_MAX |
wchar_t | WCHAR_MAX |
short | SHRT_MAX |
unsigned short | USHRT_MAX |
int | INT_MAX |
unsigned int | UINT_MAX |
long | LONG_MAX |
unsigned long | ULONG_MAX |
long long | LLONG_MAX |
unsigned long long | ULLONG_MAX |
float | FLT_MAX |
double | DBL_MAX |
long double | LDBL_MAX |
程序1:
下面是说明函数std :: numeric_limits
C++
// C++ program to illustrate the
// function numeric_limits::max
#include
#include
using namespace std;
// Driver Code
int main()
{
cout << "bool: "
<< numeric_limits::max()
<< '\n';
// It returns 127 in ASCII value
// to print in integer that can
// be typecast it to int()
cout << "char: "
<< int(numeric_limits::max())
<< '\n';
cout << "unsigned char: "
<< int(numeric_limits::max())
<< '\n';
cout << "short: "
<< numeric_limits::max()
<< '\n';
cout << "int: " << numeric_limits::max()
<< '\n';
cout << "unsigned int: "
<< numeric_limits::max()
<< '\n';
cout << "long long: "
<< numeric_limits::max()
<< '\n';
cout << "float: "
<< numeric_limits::max()
<< '\n';
cout << "double: "
<< numeric_limits::max()
<< '\n';
cout << "size_t: "
<< numeric_limits::max()
<< '\n';
}
C++
// C++ program to illustrate the
// function numeric_limits::min
#include
#include
using namespace std;
// Driver Code
int main()
{
cout << "bool: "
<< numeric_limits::min()
<< '\n';
// numeric_limits:: min()
// returns 127 in ASCII value in
// integer that can be typecast
// to int()
cout << "char: "
<< int(numeric_limits::min())
<< '\n';
cout << "unsigned char: "
<< int(numeric_limits::min())
<< '\n';
cout << "short: "
<< numeric_limits::min() << '\n';
cout << "int: " << std::numeric_limits::min()
<< '\n';
cout << "unsigned int: "
<< numeric_limits::min()
<< '\n';
cout << "long long: "
<< numeric_limits::min()
<< '\n';
cout << "float: "
<< numeric_limits::min()
<< '\n';
cout << "double: "
<< numeric_limits::min()
<< '\n';
cout << "size_t: "
<< numeric_limits::min()
<< '\n';
}
输出:
bool: 1
char: 127
unsigned char: 255
short: 32767
int: 2147483647
unsigned int: 4294967295
long long: 9223372036854775807
float: 3.40282e+38
double: 1.79769e+308
size_t: 18446744073709551615
std :: numeric_limits :: min() :
std :: numeric_limits
头文件:
#include
模板:
static T min() throw();
static constexpr T min() noexcept;
句法:
std::numeric_limits::min
参数:它接收任何一种数据类型,即T。
返回类型:返回取决于类型T的预定义宏,为true或默认T()。对于具有非规格化的浮点类型,min返回最小的正规格化值。要查找没有小于浮点数据类型的值的值,请使用numeric_limits :: lowest() 。一些标准返回值是:
Type T | std::numeric_limits::min() |
---|---|
/* non-specialized */ | T() |
bool | FALSE |
char | CHAR_MIN |
signed char | SCHAR_MIN |
unsigned char | 0 |
wchar_t | WCHAR_MIN |
short | SHRT_MIN |
unsigned short | 0 |
int | INT_MIN |
unsigned int | 0 |
long | LONG_MIN |
unsigned long | 0 |
long long | LLONG_MIN |
unsigned long long | 0 |
float | FLT_MIN |
double | DBL_MIN |
long double | LDBL_MIN |
程式2:
下面是说明函数std :: numeric_limits
C++
// C++ program to illustrate the
// function numeric_limits::min
#include
#include
using namespace std;
// Driver Code
int main()
{
cout << "bool: "
<< numeric_limits::min()
<< '\n';
// numeric_limits:: min()
// returns 127 in ASCII value in
// integer that can be typecast
// to int()
cout << "char: "
<< int(numeric_limits::min())
<< '\n';
cout << "unsigned char: "
<< int(numeric_limits::min())
<< '\n';
cout << "short: "
<< numeric_limits::min() << '\n';
cout << "int: " << std::numeric_limits::min()
<< '\n';
cout << "unsigned int: "
<< numeric_limits::min()
<< '\n';
cout << "long long: "
<< numeric_limits::min()
<< '\n';
cout << "float: "
<< numeric_limits::min()
<< '\n';
cout << "double: "
<< numeric_limits::min()
<< '\n';
cout << "size_t: "
<< numeric_limits::min()
<< '\n';
}
输出:
bool: 0
char: -128
unsigned char: 0
short: -32768
int: -2147483648
unsigned int: 0
long long: -9223372036854775808
float: 1.17549e-38
double: 2.22507e-308
size_t: 0
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