#include <stdio.h>

/* Complex numbers */

typedef struct {
    int re;
    int im;
} CPLX;

CPLX cadd( CPLX z1, CPLX z2 )
{
    CPLX zt;
    zt.re = z1.re + z2.re;
    zt.im = z1.im + z2.im;
    return zt;
}

int main( void )
{
    CPLX za, zb, zc;
    za.re = 1;
    za.im = 2;
    zb = za;

    zc = cadd( za, zb );
    printf( "zc.re = %d, zc.im = %d\n", zc.re, zc.im );
}