example2.cpp

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#include <iostream>

int add(int a, int b) {
    return a + b;
}

int main() {
    int x = 10;
    int y = 20;

    decltype(add(x, y)) result; // result is of type int
    result = add(x, y);

    std::cout << "result: " << result << std::endl;

    return 0;
}