std::numeric_limits<T>::digits in C++ with Example

The std::numeric_limits::digits function in C++ STL is present in the <limits> header file. The std::numeric_limits::digits function is used to find the number of radix digits that the data type can represent without loss of precision.

Header File:

#include<limits>

Template:

static const int digits;
static constexpr int digits;

Syntax:

std::numeric_limits<T>::digits

Parameter: The function std::numeric_limits<T>::digits does not accept any parameter.

Return Value: The function std::numeric_limits<T>::digits returns the number of radix digits that the type can represent without loss of precision.

Below is the program to demonstrate std::numeric_limits<T>::digits in C++:

Program:

// C++ program to illustrate
// std::numeric_limits<T>::digits
#include <bits/stdc++.h>
#include <limits>
using namespace std;

// Driver Code
int main()
{
    // Print the numeric digit for
    // the various data type
    cout << "For int: "
         << numeric_limits<int>::digits
         << endl;

    cout << "For float: "
         << numeric_limits<float>::digits
         << endl;

    cout << "For double: "
         << numeric_limits<double>::digits
         << endl;

    cout << "For long double: "
         << numeric_limits<long double>::digits
         << endl;

    return 0;
}

Output:

For int: 31
For float: 24
For double: 53
For long double: 64

Reference: https://en.cppreference.com/w/cpp/types/numeric_limits/digits