GeezerVison is showing github.com — learn-cpp/basic/cpp-data-types/const.cpp at master · zing-dev/learn-cpp

Expand file tree

const.cpp

Copy path

More file actions

31 lines (22 loc) · 750 Bytes

Copy path

31 lines (22 loc) · 750 Bytes

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

// Created by zing on 4/2/2020.

#include <iostream>

#include <bitset>

#include <cstddef>

std::size_t getNumberOfBits() {

return 3;

}

int main() {

const std::size_t numberOfBits{3}; // Compile-time constant

std::bitset<numberOfBits> b{};

const std::size_t otherNumberOfBits{getNumberOfBits()}; // Run-time constant

//std::bitset<otherNumberOfBits> b2{}; // Error

constexpr double gravity{9.8}; // ok, the value of 9.8 can be resolved at compile-time

constexpr int sum{4 + 5}; // ok, the value of 4 + 5 can be resolved at compile-time

std::cout << "Enter your age: ";

int age;

std::cin >> age;

//constexpr int myAge { age }; // not okay, age can not be resolved at compile-time

return 0;

}