Question

How to use tuple in C++

Answer 1

#include <iostream>
#include <tuple>

int main() {
    std::tuple<char, int, float> tpl{'z', 165774, 2.891};

    std::cout << get<0>(tpl) << ' ' << get<1>(tpl) << ' ' <<  get<2>(tpl);
}

 
 
 
/*
run:
 
z 165774 2.891
 
*/

 

70+ SQL courses for beginners and professionals

Answer 2

#include <iostream>
#include <tuple>

int main() {
    std::tuple<char, int, float> tpl{'z', 165774, 2.891};
    
    get<0>(tpl) = 'x';

    std::cout << get<0>(tpl) << ' ' << get<1>(tpl) << ' ' <<  get<2>(tpl);
}

 
 
 
/*
run:
 
x 165774 2.891
 
*/

 

70+ SQL courses for beginners and professionals

Answer 3

#include <iostream>
#include <tuple>

int main() {
    std::tuple<char, int, float> tpl{'z', 165774, 2.891};
    
    auto& [ch, num, pi] = tpl;
 
    std::cout << ch << ' ' << num << ' ' << pi;
}

 
 
 
/*
run:
 
z 165774 2.891
 
*/

 

70+ SQL courses for beginners and professionals

Answer 4

#include <iostream>
#include <tuple>

int main() {
    auto tpl = std::make_tuple(93535, "c++", 3.14);
    
    std::cout << std::get<int>(tpl)
              << ' ' << std::get<const char *>(tpl)
              << ' ' << std::get<double>(tpl);
}

 
 
 
/*
run:
 
93535 c++ 3.14
 
*/

 

70+ SQL courses for beginners and professionals