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C++ Type Modifiers
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Data Type Ranges and Their Macros in C++

Last Updated : 18 Dec, 2024
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Most of the times, in competitive programming, there is a need to assign the variable, the maximum or minimum value that data type can hold but remembering such a large and precise number comes out to be a difficult job. Therefore, C++ has certain macros to represent these numbers, so that these can be directly assigned to the variable without actually typing the whole number.

The <climits> header file in C++ defines macros that represent the upper and lower bounds of integer data types and <cfloat> defines the macros for float and double limits. These macros allow you to easily assign these extreme values to variables without manually typing them out.

Let's take a look at an example:

C++ 
#include <iostream>  // for int, char macros #include <climits>  // for float, double macros #include <cfloat>  using namespace std;  int main() {        // Displaying ranges with the help of macros     cout << "char ranges from: " << CHAR_MIN << " to "          << CHAR_MAX << endl;      cout << "\nnshort int ranges from: " << SHRT_MIN          << " to " << SHRT_MAX << endl;     cout << "\nint ranges from: " << INT_MIN << " to "          << INT_MAX << endl;     cout << "\nlong int ranges from: " << LONG_MIN << " to "          << LONG_MAX << endl;     cout << "\nfloat ranges from: " << FLT_MIN << " to "          << FLT_MAX << endl;      return 0; }


Output

char ranges from: -128 to 127

nshort int ranges from: -32768 to 32767

int ranges from: -2147483648 to 2147483647

long int ranges from: -9223372036854775808 to 9223372036854775807

float ranges from: 1.17549e-38 to 3.40282e+38

Data Types and Their Range Macros

A list of some of the data type macros is mentioned below:

Data Type

Range

Macro for min value

Macro for max value

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

--

UINT_MAX

long int

-9223372036854775808 to +9223372036854775807

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

Data Type Limits in Modern C++

The above macro approach for the upper and lower limits of the data type is the old C language approach inherited by C++. But C++ also have its own method to provide programmers with the same information.

C++ offers the numeric_limits<> class template as a modern alternative to these macros. This template provides a more object-oriented approach for accessing data type limits. It is defined inside the <limits> header file.

Let's take a look at an example:

C++ 
#include <iostream> #include <limits> using namespace std;  int main() {        // Displaying ranges with the help of macros     cout << "short int ranges from: " << numeric_limits<short int>::min()          << " to " << numeric_limits<short int>::max() << endl;     cout << "\nint ranges from: " << numeric_limits<int>::min() << " to "          << numeric_limits<int>::max() << endl;     cout << "\nlong int ranges from: " << numeric_limits<long>::min() << " to "          << numeric_limits<long>::max() << endl;     cout << "\nfloat ranges from: " << numeric_limits<float>::min() << " to "          << numeric_limits<float>::max() << endl;      return 0; }


Output

short int ranges from: -32768 to 32767

int ranges from: -2147483648 to 2147483647

long int ranges from: -9223372036854775808 to 9223372036854775807

float ranges from: 1.17549e-38 to 3.40282e+38

It is recommended to use this approach to find the upper and lower limits of the data type instead of macros as it is more type safe, and readable compared to the macro-based approach.


Next Article
C++ Type Modifiers

M

Manjeet Singh
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Article Tags :
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  • Competitive Programming
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  • DSA
  • cpp-data-types
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