Auto Type

The auto keyword lets C++ infer a variable type from its initializer.

auto_type.cpp

#include <iostream>
#include <string>

int main() {
    int count = ;
    auto doubled = count * 2;
    auto label = std::string("items");

    std::cout << "count=" << count << std::endl;
    std::cout << "doubled=" << doubled << std::endl;
    std::cout << "label=" << label << std::endl;
    return 0;
}

#include <iostream>
#include <string>

int main() {
    int count = ;
    auto doubled = count * 2;
    auto label = std::string("items");

    std::cout << "count=" << count << std::endl;
    std::cout << "doubled=" << doubled << std::endl;
    std::cout << "label=" << label << std::endl;
    return 0;
}

#include <iostream>
#include <string>

int main() {
    int count = ;
    auto doubled = count * 2;
    auto label = std::string("items");

    std::cout << "count=" << count << std::endl;
    std::cout << "doubled=" << doubled << std::endl;
    std::cout << "label=" << label << std::endl;
    return 0;
}

auto `auto` asks the compiler to choose the type from the value on the right side of `=`.