[복소수] #include <complex>

복소수

complex

#include <iostream>
#include <queue>
#include <cstdio>
#include <vector>
#include <cstring>
#include <string>
#include <cmath>
#include <algorithm>
#include <complex>
 
using namespace std;
 
// http://seismic.yonsei.ac.kr/complex.html
 
int main(void)
{
    complex<double> com3(1, 3);
    complex<double> com1(1, 2);
 
    complex<double> c;
 
    c = com3 - com1;
 
    cout << "실수부 = " << c.real() << ", 허수부 = " << c.imag() << '\n';
 
    double a = 0.0, b = 0.0;
 
    scanf("%lf %lf", &a, &b);
 
    complex<double> ab(a, b);
 
    cout << "실수부 = " << ab.real() << ", 허수부 = " << ab.imag() << '\n';
 
    if (ab.imag() != 0)
    {
        // printf("%ld\n", sqrt(pow((double)ab.real(), 2.0) + pow((double)ab.imag(), 2.0)));
 
        cout << sqrt(pow((double)ab.real(), 2.0) + pow((double)ab.imag(), 2.0)) << '\n';
    }
    return 0;
}