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supportsetlocaleNumericsabsacosacosfacoshacoshfacoshlacoslasinasinfasinhasinhfasinhlasinlatanatan2atan2fatan2latanfatanhatanhfatanhlatanlcabscabsfcabslcacoscacosfcacoshcacoshfcacoshlcacoslcargcargfcarglcasincasinfcasinhcasinhfcasinhlcasinlcatancatanfcatanhcatanhfcatanhlcatanlcbrtcbrtfcbrtlccosccosfccoshccoshfccoshlccoslceilceilfceillcexpcexpfcexplcimagcimagfcimaglclogclogfcloglCMPLXCMPLXFCMPLXLCommon mathematical functionscomplexComplex number arithmeticconjconjfconjlcopysigncopysignfcopysignlcoscosfcoshcoshfcoshlcoslcpowcpowfcpowlcprojcprojfcprojlcrealcrealfcreallcsincsinfcsinhcsinhfcsinhlcsinlcsqrtcsqrtfcsqrtlctanctanfctanhctanhfctanhlctanldivdouble_terferfcerfcferfclerfferflexpexp2exp2fexp2lexpfexplexpm1expm1fexpm1lfabsfabsffabslfdimfeclearexceptfegetenvfegetexceptflagfegetroundfeholdexceptferaiseexceptfesetenvfesetexceptflagfesetroundfetestexceptfeupdateenvFE_ALL_EXCEPTFE_DFL_ENVFE_DIVBYZEROFE_DOWNWARDFE_INEXACTFE_INVALIDFE_OVERFLOWFE_TONEARESTFE_TOWARDZEROFE_UNDERFLOWFE_UPWARDFloating-point 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在头文件<math.h>中定义 | ||
|---|---|---|
float cprojf( float complex z ); | (1) | (since C99) |
double cproj( double complex z ); | (2) | (since C99) |
long double cprojl( long double complex z ); | (3) | (since C99) |
Defined in header <tgmath.h> | ||
#define cproj( z ) | (4) | (since C99) |
1-3）计算z黎曼球上的投影。
4）式泛型宏：如果z具有类型long double complex，long double imaginary或long double，cprojl被调用。如果z有类型float complex，float imaginary或者float，cprojf被调用。如果z有类型double complex，double imaginary，double，或任何整数类型，cproj被调用。
对于大多数情况z，cproj(z)==z但所有复杂的无穷大，即使是一个分量无穷大而另一个是NaN的数字，也会变成正实的无穷大，INFINITY+0.0*I或者INFINITY-0.0*I。虚数（零）分量的符号是符号cimag(z)。
参数
z | - | 复杂的论点 |
|---|
返回值
的投影z上的黎曼球体。
该函数完全为所有可能的输入指定，并且不受math_errhandling中描述的任何错误的影响。
笔记
该cproj函数通过将所有无穷大映射到一个（给出或取出虚构零点的符号）来帮助对黎曼球体进行建模，并且应该在任何操作之前使用，特别是比较，这可能会给任何其他无穷大造成虚假结果。
例
#include <stdio.h>#include <complex.h>#include <math.h>
int main(void){
double complex z1 = cproj(1 + 2*I); printf("cproj(1+2i) = %.1f%+.1fi\n", creal(z1),cimag(z1));
double complex z2 = cproj(INFINITY+2.0*I); printf("cproj(Inf+2i) = %.1f%+.1fi\n", creal(z2),cimag(z2));
double complex z3 = cproj(INFINITY-2.0*I); printf("cproj(Inf-2i) = %.1f%+.1fi\n", creal(z3),cimag(z3));}输出：
cproj(1+2i) = 1.0+2.0icproj(Inf+2i) = inf+0.0icproj(Inf-2i) = inf-0.0i
参考
C11标准（ISO / IEC 9899：2011）：
7.3.9.5 cproj函数（p：198）
7.25类型通用数学<tgmath.h>（p：373-375）
G.7类型 - 通用数学<tgmath.h>（p：545）
C99标准（ISO / IEC 9899：1999）：
7.3.9.4 cproj函数（p：179）
7.22类型通用数学<tgmath.h>（p：335-337）
G.7类型 - 通用数学<tgmath.h>（p：480）