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auto c++

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Dmytro Skorobahat'ko answered on May 11, 2021 Popularity 6/10 Helpfulness 5/10

answer auto c++

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auto c++

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#include <iostream>
#include <vector>
 
int main()
{
    std::vector<int> v = {0, 1, 2, 3, 4, 5};
 
    for (const int& i : v) // access by const reference
        std::cout << i << ' ';
    std::cout << '\n';
 
    for (auto i : v) // access by value, the type of i is int
        std::cout << i << ' ';
    std::cout << '\n';
 
    for (auto&& i : v) // access by forwarding reference, the type of i is int&
        std::cout << i << ' ';
    std::cout << '\n';
 
    const auto& cv = v;
 
    for (auto&& i : cv) // access by f-d reference, the type of i is const int&
        std::cout << i << ' ';
    std::cout << '\n';
 
    for (int n : {0, 1, 2, 3, 4, 5}) // the initializer may be a braced-init-list
        std::cout << n << ' ';
    std::cout << '\n';
 
    int a[] = {0, 1, 2, 3, 4, 5};
    for (int n : a) // the initializer may be an array
        std::cout << n << ' ';
    std::cout << '\n';
 
    for ([[maybe_unused]] int n : a)  
        std::cout << 1 << ' '; // the loop variable need not be used
    std::cout << '\n';
 
    for (auto n = v.size(); auto i : v) // the init-statement (C++20)
        std::cout << --n + i << ' ';
    std::cout << '\n';
 
    for (typedef decltype(v)::value_type elem_t; elem_t i : v)
    // typedef declaration as init-statement (C++20)
        std::cout << i << ' ';
    std::cout << '\n';
 
    for (using elem_t = decltype(v)::value_type; elem_t i : v)
    // alias declaration as init-statement (C++23)
        std::cout << i << ' ';
    std::cout << '\n';
}

Popularity 6/10 Helpfulness 5/10 Language cpp

Source: en.cppreference.com

Tags: auto c++

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Contributed on Apr 01 2024

Dmytro Skorobahat'ko

0 Answers Avg Quality 2/10

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for auto c++

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for (auto&& [first,second] : mymap) {
    // use first and second
}

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: en.cppreference.com

Tags: auto

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Contributed on Oct 14 2021

Smiling Seal

0 Answers Avg Quality 2/10

auto in c++

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int foo = 0;
auto bar = foo;  // the same as: int bar = foo; 
// type of bar is the type of the value used to initialize it

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: cplusplus.com

Tags: auto

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Contributed on May 11 2021

Lazy Lyrebird

0 Answers Avg Quality 2/10

c++ auto

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//When using auto variables, the data type is decided in initialisation

#include <iostream>
using namespace std;

int main() {
    auto IntegerVar=25;   //creates integer type variable
    auto FloatVar=26.77;  //creates float type variable
    auto StringVar="Hello";  //creates string type variable
    auto CharVar="C";   //creates char type variable
  
    cout<<"CREATING VARIABLES USING AUTO DATA TYPE\n\n";
    cout<<"Integer: "<<IntegerVar<<endl;
    cout<<"Float: "<<FloatVar<<endl;
    cout<<"String: "<<StringVar<<endl;
    cout<<"Char: "<<CharVar;
    
    cout<<"\n\n";
    return 0;
}

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: Grepper

Tags: auto

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Contributed on May 11 2022

ALeonidou

0 Answers Avg Quality 2/10

auto i cpp

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auto n=1;
// this will make the type int, and you can't change trough the program;
cout << n;
// OR
auto n="how you doin'";
cout << n;

Popularity 10/10 Helpfulness 1/10 Language cpp

Source: Grepper

Tags: auto

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Contributed on Oct 05 2021

Healthy Hedgehog

0 Answers Avg Quality 2/10

auto c++

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