[C++] 複素数から実部を取得する方法

#include <iostream>
#include <complex> // 複素数を扱うためのライブラリをインクルード
int main() {
    std::complex<double> z(3.0, 4.0); // 複素数の宣言と初期化
    std::cout << "Real part: " << z.real() << std::endl; // 実部の出力
    std::cout << "Imaginary part: " << z.imag() << std::endl; // 虚部の出力
    return 0;
}

#include <complex>
std::complex<double> z1; // デフォルトコンストラクタで初期化(0 + 0i)
std::complex<double> z2(3.0, 4.0); // 実部3.0、虚部4.0で初期化
std::complex<double> z3 = std::polar(5.0, 0.927); // 極形式で初期化

#include <iostream>
#include <complex>
int main() {
    std::complex<double> z1(3.0, 4.0);
    std::complex<double> z2(1.0, 2.0);
    std::complex<double> sum = z1 + z2; // 加算
    std::complex<double> diff = z1 - z2; // 減算
    std::complex<double> prod = z1 * z2; // 乗算
    std::complex<double> quot = z1 / z2; // 除算
    std::cout << "Sum: " << sum << std::endl;
    std::cout << "Difference: " << diff << std::endl;
    std::cout << "Product: " << prod << std::endl;
    std::cout << "Quotient: " << quot << std::endl;
    return 0;
}

#include <iostream>
#include <complex>
int main() {
    std::complex<double> z(3.0, 4.0); // 複素数の宣言と初期化
    double realPart = z.real(); // 実部の取得
    std::cout << "Real part: " << realPart << std::endl; // 実部の出力
    return 0;
}

#include <iostream>
#include <complex>
int main() {
    std::complex<double> z(3.0, 4.0); // 複素数の宣言と初期化
    double realPart = std::real(z); // std::real()関数を使用して実部を取得
    std::cout << "Real part: " << realPart << std::endl; // 実部の出力
    return 0;
}

#include <iostream>
#include <complex>
int main() {
    std::complex<double> z1(5.0, 12.0);
    std::complex<double> z2(3.0, 4.0);
    // 複素数の実部を取得
    double realPart1 = z1.real();
    double realPart2 = std::real(z2);
    // 実部を用いた計算
    double sumOfRealParts = realPart1 + realPart2;
    std::cout << "Sum of real parts: " << sumOfRealParts << std::endl;
    return 0;
}

#include <iostream>
#include <complex>
#include <vector>
int main() {
    std::vector<std::complex<double>> complexNumbers = {
        {3.0, 4.0}, {1.0, 2.0}, {5.0, 6.0}
    };
    double sumOfRealParts = 0.0;
    for (const auto& z : complexNumbers) {
        sumOfRealParts += z.real(); // 各複素数の実部を加算
    }
    std::cout << "Total sum of real parts: " << sumOfRealParts << std::endl;
    return 0;
}

#include <iostream>
#include <complex>
#include <vector>
#include <cmath>
int main() {
    std::vector<std::complex<double>> complexNumbers = {
        {1.0, 2.0}, {2.0, 3.0}, {3.0, 4.0}, {4.0, 5.0}
    };
    std::cout << "Plotting points (Real part, Magnitude):" << std::endl;
    for (const auto& z : complexNumbers) {
        double magnitude = std::abs(z); // 複素数の大きさを計算
        std::cout << "(" << z.real() << ", " << magnitude << ")" << std::endl;
    }
    return 0;
}

#include <iostream>
#include <complex>
#include <vector>
int main() {
    std::vector<std::complex<double>> frequencyDomainSignal = {
        {10.0, 5.0}, {8.0, 3.0}, {6.0, 1.0}
    };
    std::cout << "Real parts of frequency domain signal:" << std::endl;
    for (const auto& z : frequencyDomainSignal) {
        std::cout << z.real() << std::endl; // 各周波数成分の実部を出力
    }
    return 0;
}