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C++ - <climits>



The C++ <climits> header file defines constants with the limits of fundamental integral types for the specific system and compiler implementation used. The limits for fundamental floating-point types are defined in <cfloat> (float.h). The limits for width-specific integral types and other typedef types are defined in <cstdint> (stdint.h).

C++ <climits> Macro Constants

The below mentioned macros are implementation-specific and defined with the #define directive. The table below shows the different macros in <climits> header and their minimal or maximal values in all implementations.

MacrosDescriptionValue
CHAR_BITNumber of bits in a char object (byte) 8 or greater
SCHAR_MINMinimum value for an object of type signed char (-27+1) or less
SCHAR_MAXMaximum value for an object of type signed char (27-1) or greater
UCHAR_MAXMaximum value for an object of type unsigned char (28-1) or greater
CHAR_MINMinimum value for an object of type char either SCHAR_MIN or 0
CHAR_MAXMaximum value for an object of type char either SCHAR_MAX or UCHAR_MAX
MB_LEN_MAXMaximum number of bytes in a multi-byte character, for any locale 1 or greater
SHRT_MINMinimum value for an object of type short int (-215+1) or less
SHRT_MAXMaximum value for an object of type short int (215-1) or greater
USHRT_MAXMaximum value for an object of type unsigned short int (216-1) or greater
INT_MINMinimum value for an object of type int (-215+1) or less
INT_MAXMaximum value for an object of type int (215-1) or greater
UINT_MAXMaximum value for an object of type unsigned int (216-1) or greater
LONG_MINMinimum value for an object of type long int (-231+1) or less
LONG_MAXMaximum value for an object of type long int (231-1) or greater
ULONG_MAXMaximum value for an object of type unsigned long int (232-1) or greater
LLONG_MINMinimum value for an object of type long long int (-263+1) or less
LLONG_MAXMaximum value for an object of type long long int (263-1) or greater
ULLONG_MAXMaximum value for an object of type unsigned long long int (264-1) or greater

Example:

The example below describes the working of macros constant of C++ <climits> library.

#include <iostream>
#include <climits>
using namespace std;

int main (){

  cout<<"CHAR_BIT: "<<CHAR_BIT<<"\n";
  cout<<"CHAR_MIN: "<<CHAR_MIN<<"\n";
  cout<<"CHAR_MAX: "<<CHAR_MAX<<"\n";  
  cout<<"SHRT_MIN: "<<SHRT_MIN<<"\n";
  cout<<"SHRT_MAX: "<<SHRT_MAX<<"\n";  
  cout<<"LONG_MIN: "<<LONG_MIN<<"\n";
  cout<<"LONG_MAX: "<<LONG_MAX<<"\n";
  cout<<"LLONG_MIN: "<<LLONG_MIN<<"\n";
  cout<<"LLONG_MAX: "<<LLONG_MAX<<"\n";
  return 0;
}

The output of the above code is machine dependent. One of the possible output could be:

CHAR_BIT: 8
CHAR_MIN: -128
CHAR_MAX: 127
SHRT_MIN: -32768
SHRT_MAX: 32767
LONG_MIN: -9223372036854775808
LONG_MAX: 9223372036854775807
LLONG_MIN: -9223372036854775808
LLONG_MAX: 9223372036854775807

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