cabs.c

来自「DTMK软件开发包,此为开源软件,是一款很好的医学图像开发资源.」· C语言 代码 · 共 39 行

#include "v3p_f2c.h"
#undef abs
#undef min
#undef max

#ifdef KR_headers
extern double sqrt();
double f__cabs(real, imag) double real, imag;
#else
#undef abs
#include "math.h"
#ifdef __cplusplus
extern "C" {
#endif
double f__cabs(double real, double imag)
#endif
{
double temp;

if(real < 0)
        real = -real;
if(imag < 0)
        imag = -imag;
if(imag > real){
        temp = real;
        real = imag;
        imag = temp;
}
if((real+imag) == real)
        return(real);

temp = imag/real;
temp = real*sqrt(1.0 + temp*temp);  /*overflow!!*/
return(temp);
}
#ifdef __cplusplus
}
#endif