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Source Code
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#include <complex>
#include <iomanip>
#include <iostream>
int main() {
std::complex<double> z1{3.0, 4.0}; // 3.0 + 4.0i
std::complex<double> z2{1.0, -2.0}; // 1.0 - 2.0i
std::complex<double> z3 = z1 + z2;
double re = z3.real();
double im = z3.imag();
std::cout << std::fixed << std::setprecision(1) << re;
if (im >= 0)
std::cout << '+';
std::cout << im << 'i' << '\n'; // wypisane zostanie: 4.0+2.0i
return 0;
}
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