Data Type Ranges and Their Macros in C++

In some cases, we need to use the minimum or maximum value of a specific datatype in different problems. It is very difficult to remember that value. For that reason, C++ has some macros, that are used to denote the minimum and maximum range of some datatype. Some of them do not have macros, because they are unsigned, so the minimum will be 0.

We can see a simple program to print the range of some data types of C++.

Example

#include<iostream>
#include<limits.h> // for int,char macros
#include<float.h> // for float,double macros
using namespace std;
int main() {
   cout << "char Range: (" << CHAR_MIN <<", " <<CHAR_MAX << ")\n";
   cout << "short char Range: (" << SCHAR_MIN <<", " <<SCHAR_MAX << ")\n";
   cout << "unsigned char Range: (" << 0 <<", " <<UCHAR_MAX << ")\n";
   cout << "short int Range: (" << SHRT_MIN <<", " <<SHRT_MAX << ")\n";
   cout << "unsigned short int Range: (" << 0 <<", " <<USHRT_MAX << ")\n";
   cout << "int Range: (" << INT_MIN <<", " <<INT_MAX << ")\n";
   cout << "unsigned int Range: (" << 0 <<", " <<UINT_MAX << ")\n";
   cout << "long int Range: (" << LONG_MIN <<", " <<LONG_MAX << ")\n";
   cout << "unsigned long int Range: (" << 0 <<", " <<ULONG_MAX << ")\n";
   cout << "long long int Range: (" << LLONG_MIN <<", " <<LLONG_MAX << ")\n";
   cout << "unsigned long long int Range: (" << 0 <<", " <<ULLONG_MAX << ")\n";
   cout << "float Range: (" << FLT_MIN <<", " <<FLT_MAX << ")\n";
   cout << "float(negative) Range: (" << -FLT_MIN <<", " <<-FLT_MAX << ")\n";
   cout << "double Range: (" << DBL_MIN <<", " <<DBL_MAX << ")\n";
   cout << "double(negative) Range: (" << -DBL_MIN <<", " <<-DBL_MAX << ")";
}

Output

char Range: (-128, 127)
short char Range: (-128, 127)
unsigned char Range: (0, 255)
short int Range: (-32768, 32767)
unsigned short int Range: (0, 65535)
int Range: (-2147483648, 2147483647)
unsigned int Range: (0, 4294967295)
long int Range: (-2147483648, 2147483647)
unsigned long int Range: (0, 4294967295)
long long int Range: (-9223372036854775808, 9223372036854775807)
unsigned long long int Range: (0, 18446744073709551615)
float Range: (1.17549e-038, 3.40282e+038)
float(negative) Range: (-1.17549e-038, -3.40282e+038)
double Range: (2.22507e-308, 1.79769e+308)
double(negative) Range: (-2.22507e-308, -1.79769e+308)