Repository navigation
Expand file tree
/
Copy pathcomplex_first_cpp.cc
More file actions
executable file
·76 lines (63 loc) · 3.3 KB
/
Copy pathcomplex_first_cpp.cc
File metadata and controls
executable file
·76 lines (63 loc) · 3.3 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
/*************************************************/
/* LAPACK/BLAS Tutorial */
/* Sample program with C++ complex type */
/* Last Update: 2016-12-01 (Thu) T.Kouya */
/*************************************************/
#include <iostream>
#include <complex>
#include <cstdio>
using namespace std;
int main()
{
complex<float> cc = 0.0, ca = complex<float>(-2.0, 2.0), cb = complex<float>(3.0, -3.0);
complex<double> zc = 0.0, za = complex<double>(-2.0, 2.0), zb = complex<double>(3.0, -3.0);
double relerr;
// basic arithmetic: float complex
cout << "--- float data type(single precsion floating-point number) ---" << endl;
cc = ca + cb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) + (%25.17e %+-25.17e * I)\n", cc.real(), cc.imag(), ca.real(), ca.imag(), cb.real(), cb.imag());
cc = ca - cb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) - (%25.17e %+-25.17e * I)\n", cc.real(), cc.imag(), ca.real(), ca.imag(), cb.real(), cb.imag());
cc = ca * cb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) * (%25.17e %+-25.17e * I)\n", cc.real(), cc.imag(), ca.real(), ca.imag(), cb.real(), cb.imag());
cc = ca / cb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) / (%25.17e %+-25.17e * I)\n", cc.real(), cc.imag(), ca.real(), ca.imag(), cb.real(), cb.imag());
// absolute value and square root: float
cc = abs(ca);
printf("%25.17e %+-25.17e * I := |%25.17e %+-25.17e * I|\n", cc.real(), cc.imag(), ca.real(), ca.imag());
cc = sqrt(cb);
printf("%25.17e %+-25.17e * I:= sqrt(%25.17e %+-25.17e * I)\n", cc.real(), cc.imag(), cb.real(), cb.imag());
// 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", zc.real(), zc.imag(), za.real(), za.imag(), zb.real(), zb.imag());
zc = za - zb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) - (%25.17e %+-25.17e * I)\n", zc.real(), zc.imag(), za.real(), za.imag(), zb.real(), zb.imag());
zc = za * zb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) * (%25.17e %+-25.17e * I)\n", zc.real(), zc.imag(), za.real(), za.imag(), zb.real(), zb.imag());
zc = za / zb;
printf("%25.17e %+-25.17e * I := (%25.17e %+-25.17e * I) / (%25.17e %+-25.17e * I)\n", zc.real(), zc.imag(), za.real(), za.imag(), zb.real(), zb.imag());
// absolute value and square root: double
zc = abs(za);
printf("%25.17e %+-25.17e * I := |%25.17e %+-25.17e * I|\n", zc.real(), zc.imag(), za.real(), za.imag());
zc = sqrt(zb);
printf("%25.17e %+-25.17e * I:= sqrt(%25.17e %+-25.17e * I)\n", zc.real(), zc.imag(), zb.real(), zb.imag());
// relative error of float square root
relerr = abs((complex<double>)cc - zc);
if(abs(zc) > 0.0)
relerr /= abs(zc);
printf("Single Prec. : %25.17e %+-25.17e * I\n", cc.real(), cc.imag());
printf("Double Prec. : %25.17e %+-25.17e * I\n", zc.real(), zc.imag());
printf("Relative Error: %10.3e\n", relerr);
// real part
relerr = abs(cc.real() - zc.real());
if(abs(zc.real()) > 0.0)
relerr /= abs(zc.real());
printf("Relative Error(real): %10.3e\n", relerr);
// imaginary part
relerr = abs(cc.imag() - zc.imag());
if(abs(zc.imag()) > 0.0)
relerr /= abs(zc.imag());
printf("Relative Error(imag): %10.3e\n", relerr);
return 0;
}