C _Complex

float _Complex z_float;             // Two floats
double _Complex z_double;           // Two doubles
long double _Complex z_long_double; // Two long doubles

#include <stdio.h>
#include <complex.h>

int main(void) {
    // 'complex' is a macro for '_Complex'
    double complex z = 3.0 + 4.0 * I; 
    
    printf("z = %.1f + %.1fi\n", creal(z), cimag(z));
    return 0;
}

#include <stdio.h>
#include <complex.h>

int main(void) {
    double _Complex z = 5.0 + 2.0 * I;

    // Valid and strictly conforming memory access
    double *ptr = (double *)&z;
    double real_part = ptr[0]; 
    double imag_part = ptr[1]; 

    printf("Real: %.1f, Imaginary: %.1f\n", real_part, imag_part);
    return 0;
}

#include <stdio.h>
#include <complex.h>

int main(void) {
    // C11 standard initialization
    double complex z = CMPLX(0.0, -1.0);

    // Strictly typed component extraction
    double r = creal(z); // Takes double complex, returns double
    double i = cimag(z); // Takes double complex, returns double

    printf("r = %.1f, i = %.1f\n", r, i);
    return 0;
}

#include <stdio.h>
#include <complex.h>

int main(void) {
    double _Complex z1 = 1.0 + 2.0 * I;
    double _Complex z2 = 3.0 - 4.0 * I;

    double _Complex sum = z1 + z2; 
    double _Complex prd = z1 * z2; 

    printf("Sum: %.1f %+.1fi\n", creal(sum), cimag(sum));
    printf("Product: %.1f %+.1fi\n", creal(prd), cimag(prd));
    return 0;
}