std::numeric_limits<T>::lowest
From cppreference.com
static constexpr T lowest() noexcept;
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(since C++11) | |
Returns the lowest finite value representable by the numeric type T, that is, a finite value x such that there is no other finite value y where y < x. This is different from std::numeric_limits<T>::min() for floating-point types. Only meaningful for bounded types.
Return value
T
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std::numeric_limits<T>::lowest()
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/* non-specialized */
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T()
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bool
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false
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char
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CHAR_MIN |
signed char
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SCHAR_MIN |
unsigned char
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0
|
wchar_t
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WCHAR_MIN |
char8_t (since C++20)
|
0
|
char16_t
|
0
|
char32_t
|
0
|
short
|
SHRT_MIN |
unsigned short
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0
|
int
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INT_MIN |
unsigned int
|
0
|
long
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LONG_MIN |
unsigned long
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0
|
long long
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LLONG_MIN |
unsigned long long
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0
|
float
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-FLT_MAX
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double
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-DBL_MAX
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long double
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-LDBL_MAX
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Notes
For every standard C++ floating-point type T std::numeric_limits<T>::lowest() == -std::numeric_limits<T>::max(), but this does not necessarily have to be the case for any third-party specialization.
Example
Demonstrates min(), max(), and lowest() for floating-point types:
Run this code
#include <iostream>
#include <limits>
#include <string_view>
template<typename T>
void print_twice(std::string_view type, T value)
{
std::cout << '\t' << type << ": "
<< std::defaultfloat << value << " or "
<< std::hexfloat << value << '\n';
}
int main()
{
// min()
std::cout << "std::numeric_limits<T>::min():\n";
print_twice("float", std::numeric_limits<float>::min());
print_twice("double", std::numeric_limits<double>::min());
print_twice("long double", std::numeric_limits<long double>::min());
// lowest()
std::cout << "std::numeric_limits<T>::lowest():\n";
print_twice("float", std::numeric_limits<float>::lowest());
print_twice("double", std::numeric_limits<double>::lowest());
print_twice("long double", std::numeric_limits<long double>::lowest());
// max()
std::cout << "std::numeric_limits<T>::max():\n";
print_twice("float", std::numeric_limits<float>::max());
print_twice("double", std::numeric_limits<double>::max());
print_twice("long double", std::numeric_limits<long double>::max());
}
Output:
std::numeric_limits<T>::min():
float: 1.17549e-38 or 0x1p-126
double: 2.22507e-308 or 0x1p-1022
long double: 3.3621e-4932 or 0x8p-16385
std::numeric_limits<T>::lowest():
float: -3.40282e+38 or -0x1.fffffep+127
double: -1.79769e+308 or -0x1.fffffffffffffp+1023
long double: -1.18973e+4932 or -0xf.fffffffffffffffp+16380
std::numeric_limits<T>::max():
float: 3.40282e+38 or 0x1.fffffep+127
double: 1.79769e+308 or 0x1.fffffffffffffp+1023
long double: 1.18973e+4932 or 0xf.fffffffffffffffp+16380