/* cmplx.h - complex arithmetic declarations */#include <math.h>                         /* in MSC and TC/BC, it declarares: */                                          /* \ttt{struct complex} and \ttt{cabs(z)} *//* struct complex{double x, y;}; */       /* uncomment if neccessary *//* double cabs(struct complex); */        /* uncomment if neccesary */typedef struct complex complex;complex cmplx(double, double);            /* define complex number */complex conjg(complex);                   /* complex conjugate */complex cadd(complex, complex);           /* complex addition */complex csub(complex, complex);           /* complex subtraction */complex cmul(complex, complex);           /* complex multiplication */complex cdiv(complex, complex);           /* complex division */complex rmul(double, complex);            /* multiplication by real */complex rdiv(complex, double);            /* division by real */double real(complex);                     /* real part */double aimag(complex);                    /* imaginary part */complex cexp(complex);                    /* complex exponential */