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executable file
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/*************************************************/
/* LAPACK/BLAS Tutorial */
/* Sample program with C99 complex type */
/* Last Update: 2016-12-01 (Thu) T.Kouya */
/*************************************************/
#include <stdio.h>
#include <math.h>
#include <complex.h> // C99 Complex data type
int main()
{
float complex cc = 0.0, ca = -2.0 + 2.0 * I, cb = 3.0 - 3.0 * I;
double complex zc = 0.0, za = -2.0 + 2.0 * I, zb = 3.0 - 3.0 * I;
double relerr;
// basic arithmetic: float complex
printf("--- float data type(single precsion floating-point number) ---\n");
cc = ca + cb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) + (%25.17e %+-25.17e * I)\n", crealf(cc), cimagf(cc), crealf(ca), cimagf(ca), crealf(cb), cimagf(cb));
cc = ca - cb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) - (%25.17e %+-25.17e * I)\n", crealf(cc), cimagf(cc), crealf(ca), cimagf(ca), crealf(cb), cimagf(cb));
cc = ca * cb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) * (%25.17e %+-25.17e * I)\n", crealf(cc), cimagf(cc), crealf(ca), cimagf(ca), crealf(cb), cimagf(cb));
cc = ca / cb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) / (%25.17e %+-25.17e * I)\n", crealf(cc), cimagf(cc), crealf(ca), cimag(ca), creal(cb), cimagf(cb));
// absolute value and square root: float
cc = cabsf(ca);
printf("%25.17e %+-25.17e * I := |%25.17e %+-25.17e * I|\n", crealf(cc), cimagf(cc), crealf(ca), cimagf(ca));
cc = csqrtf(cb);
printf("%25.17e %+-25.17e * I:= sqrt(%25.17e %+-25.17e * I)\n", crealf(cc), cimagf(cc), crealf(cb), cimagf(cb));
// basic arithmetic: double
printf("--- double data type(double precsion floating-point number) ---\n");
zc = za + zb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) + (%25.17e %+-25.17e * I)\n", creal(zc), cimag(zc), creal(za), cimag(za), creal(zb), cimag(zb));
zc = za - zb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) - (%25.17e %+-25.17e * I)\n", creal(zc), cimag(zc), creal(za), cimag(za), creal(zb), cimag(zb));
zc = za * zb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) * (%25.17e %+-25.17e * I)\n", creal(zc), cimag(zc), creal(za), cimag(za), creal(zb), cimag(zb));
zc = za / zb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) / (%25.17e %+-25.17e * I)\n", creal(zc), cimag(zc), creal(za), cimag(za), creal(zb), cimag(zb));
// absolute value and square root: double
zc = cabs(za);
printf("%25.17e %+-25.17e * I := |%25.17e %+-25.17e * I|\n", creal(zc), cimag(zc), creal(za), cimag(za));
zc = csqrt(zb);
printf("%25.17e %+-25.17e * I:= sqrt(%25.17e %+-25.17e * I)\n", creal(zc), cimag(zc), creal(zb), cimag(zb));
// relative error of float square root
relerr = cabs(cc - zc);
if(cabs(zc) > 0.0)
relerr /= cabs(zc);
printf("Single Prec. : %25.17e + %25.17e * I\n", creal(cc), cimag(cc));
printf("Double Prec. : %25.17e + %25.17e * I\n", creal(zc), cimag(zc));
printf("Relative Error: %10.3e\n", relerr);
// real part
relerr = fabs(creal(cc) - creal(zc));
if(fabs(creal(zc)) > 0.0)
relerr /= fabs(creal(zc));
printf("Relative Error(real): %10.3e\n", relerr);
// imaginary part
relerr = fabs(cimag(cc) - cimag(zc));
if(fabs(cimag(zc)) > 0.0)
relerr /= fabs(cimag(zc));
printf("Relative Error(imag): %10.3e\n", relerr);
return 0;
}