C++ Unsigned Long Long Maximum Value

In C++, an unsigned long long is an integer data type used to store only non-negative integer values. It provides an extremely large range for positive numbers, making it ideal for scenarios requiring large numerical storage. The size of an unsigned long long is at least 64 bits, and the maximum value it can represent is 18,446,744,073,709,551,615. This value is defined by the ULLONG_MAX macro in the <climits> header.

Maximum Limit of Unsigned Long Long Data Type

The unsigned long long data type represents numbers in the range:

  • Minimum Value: 0
  • Maximum Value: 18,446,744,073,709,551,615

The range is derived from the formula:

0 to 2^n - 1

Where n is the number of bits used by the data type. For an unsigned long long, n = 64, resulting in:

0 to 2^64 - 1 = 0 to 18,446,744,073,709,551,615

From this, the maximum limit of an unsigned long long data type is 18,446,744,073,709,551,615.

C++ Program to Access Unsigned Long Long Maximum Value

You can programmatically access the maximum value of an unsigned long long using the ULLONG_MAX constant from the <climits> header.

The following example demonstrates how to access and use the maximum value of an unsigned long long in your programs:

main.cpp

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#include <iostream>
#include <climits>

int main() {
    // Accessing the maximum value of unsigned long long
    std::cout << "The maximum value of unsigned long long is: " << ULLONG_MAX << std::endl;
    return 0;
}

Output

The maximum value of unsigned long long is: 18446744073709551615

Explanation

  • The <climits> header provides macros for the limits of fundamental data types in C++.
  • The ULLONG_MAX macro defines the maximum value of an unsigned long long, which is 18,446,744,073,709,551,615.
  • The program uses std::cout to output the maximum value of an unsigned long long directly using ULLONG_MAX.