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Variables and types

Built-in types, auto, const, std::string, conversions, and integer division.

Runs in Zerethon IDE · C++ (GCC 14) Official C++ documentation ↗
main.cpp 
#include <iostream>
#include <string>

int main() {
    int count = 3;
    double price = 9.5;
    long long big = 3'000'000'000LL;
    bool ready = true;
    std::string name = "Ada";
    auto total = count * price;   // double
    constexpr int MAX = 10;

    std::cout << count << ' ' << price << ' ' << big << ' ' << std::boolalpha << ready << ' ' << name << '\n';
    std::cout << total << ' ' << MAX << '\n';
    std::cout << 7 / 2 << ' ' << 7 / 2.0 << ' ' << 7 % 2 << ' ' << static_cast<int>(3.99) << '\n';
    std::cout << std::stoi("42") + 1 << ' ' << std::stod("2.5") * 2 << ' ' << std::to_string(7) + "7" << '\n';
}

Output

3 9.5 3000000000 true Ada
28.5 10
3 3.5 1 3
43 5 77
  • int / int is whole-number division; make one side double for a fraction.
  • Use std::string for text, not char*; compare with ==.
  • Prefer static_cast<int>(x) to C-style (int) x.
  • A local variable without a value holds garbage — initialise it (int n = 0; or int n{};).

Related topics

Official references