Complex-C basics in C Language

Complex Number: For details about the complex number, see: complex number algebra C supports mathematical calculation of the complex number. The complex number Z can be expressed as: Z = x + y * I in Cartesian coordinates; x and y are real numbers, and I is a virtual number unit. Number x is called the real part, and number y is the virtual part. In C, a plural number is the real and virtual parts of the floating point type. Both have the same type, whether float, double, or long double. Float _ complex: the actual virtual files are all floatdouble _ complex: the actual virtual files are all doublelong double _ complex: the actual virtual files are all long double. If the c source file contains the header file complex. h, complex. h defines complex and I macros. The macro defines complex as synonymous with the keyword _ complex. We can replace _ complex with complex. the following is a simple example. Run the detailed code In debian 7 (32bit): Copy code 1/* 2 * Title: Complex Numbers 3 * Description: work with complex numbers in c 4 * Author: Eric. lee 5*6 */7 # include <stdio. h> 8 # include <complex. h> 9 10 # define Get_Array_Length (tempArray) (sizeof (tempArray)/sizeof (tempArray [0]) 11 12 void GetResult (char operate, double complex x, double complex y) 13 {14 double complex result = 0 + 0 * I; 15 switch (operate) 16 {17 case '+': 18 result = x + y; 19 break; 20 case '-': 21 result = x-y; 22 break; 23 case '*': 24 result = x * y; 25 break; 26 case '/': 27 result = x/y; 28 break; 29 default: 30 break; 31} 32 printf ("double complex x % c double complex y = %. 2f + %. 2fi \ n ", operate, creal (result), cimag (result); 33 34} 35 36 int main () 37 {38 double complex x = 10.0 + 15.0 * I; 39 double complex y = 20.0-5.0 * I; 40 41 printf ("working with complex number: \ n"); 42 printf ("Starting values: x = %. 2f + %. 2fi \ ty = %. 2f + %. 2fi \ n ", creal (x), cimag (x), creal (y), cimag (y); 43 char operates [] = {'+ ', '-', '*', '/'}; 44 char * op = operates; 45 int I = 0; 46 int operateLength = Get_Array_Length (operates ); 47 for (I = 0; I <= operateLength-1; I ++) 48 {49 GetResult (* (op ++), x, y); 50} 51 52 return 0; 53} copy code creal (x): Obtain the real part of the complex number (for double). If crealf (x) is used for float, use creall (x) for long double) cimag (x): Obtain the imaginary part of the plural number (for double). If float is used, use crealf (x). If long double is used, use creall (x) additionally, cos (), exp (), and sqrt () correspond to the plural methods, such as ccos (), cexp (), and csqrt ()