std::numeric_limits::max() and std::numeric_limits::min() in C++
Last Updated : 01 Feb, 2021
std::numeric_limits::max():
The std::numeric_limits<T>::max() function is used to get the maximum finite value representable by the numeric type T. All arithmetic types are valid for type T.
Header File:
#include<limits>
Template:
static T max() throw(); static constexpr T max() noexcept;
Syntax:
std::numeric_limits<T>::max
Parameter: It receives any one type of data type i.e., T.
Return Type: It returns predefined macros, true or default T() depending on type T. Some standard return values are:
| Type T | std::numeric_limits<T>::max() |
|---|
| /* 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 |
Program 1:
Below is the program to illustrate the function std::numeric_limits<T>::max(). The output of the program is system-specific.
C++ // C++ program to illustrate the // function numeric_limits<T>::max #include <iostream> #include <limits> using namespace std; // Driver Code int main() { cout << "bool: " << numeric_limits<bool>::max() << '\n'; // It returns 127 in ASCII value // to print in integer that can // be typecast it to int() cout << "char: " << int(numeric_limits<char>::max()) << '\n'; cout << "unsigned char: " << int(numeric_limits<unsigned char>::max()) << '\n'; cout << "short: " << numeric_limits<short>::max() << '\n'; cout << "int: " << numeric_limits<int>::max() << '\n'; cout << "unsigned int: " << numeric_limits<unsigned int>::max() << '\n'; cout << "long long: " << numeric_limits<long long>::max() << '\n'; cout << "float: " << numeric_limits<float>::max() << '\n'; cout << "double: " << numeric_limits<double>::max() << '\n'; cout << "size_t: " << numeric_limits<size_t>::max() << '\n'; } Output: 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():
The std::numeric_limits<T>::min() function is used to get the minimum finite value representable by the numeric type T. All bounded arithmetic types are valid for type T.
Header File:
#include<limits>
Template:
static T min() throw(); static constexpr T min() noexcept;
Syntax:
std::numeric_limits<T>::min
Parameter: It receives any one type of data type i.e., T.
Return Type: It returns predefined macros, true or default T() depending on type T. For floating-point types with denormalization, min returns the minimum positive normalized value. To find the value that has no values less than it for floating data type, use numeric_limits::lowest(). Some standard return values are:
| 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 |
Program 2:
Below is the program to illustrate the function std::numeric_limits<T>::min(). The output of the program is system-specific.
C++ // C++ program to illustrate the // function numeric_limits<T>::min #include <iostream> #include <limits> using namespace std; // Driver Code int main() { cout << "bool: " << numeric_limits<bool>::min() << '\n'; // numeric_limits<char>:: min() // returns 127 in ASCII value in // integer that can be typecast // to int() cout << "char: " << int(numeric_limits<char>::min()) << '\n'; cout << "unsigned char: " << int(numeric_limits<unsigned char>::min()) << '\n'; cout << "short: " << numeric_limits<short>::min() << '\n'; cout << "int: " << std::numeric_limits<int>::min() << '\n'; cout << "unsigned int: " << numeric_limits<unsigned int>::min() << '\n'; cout << "long long: " << numeric_limits<long long>::min() << '\n'; cout << "float: " << numeric_limits<float>::min() << '\n'; cout << "double: " << numeric_limits<double>::min() << '\n'; cout << "size_t: " << numeric_limits<size_t>::min() << '\n'; } Output: 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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