求助求助——有关C语言编辑的错误
本人不是计算机专业，不熟悉C语言编程，最近在用软件的时候需要UDF编程，我编好C语言之后检查编译老是出现错误，请各位大师指点一下啊。不胜感激。
程序代码：#include"udf.h"
#define PI 3.141593
#define Rg 9.314
#define Pc 7.376e6
#define Tc 304.2
#define Mw 44
#define omiga 0.225
#define Vc 2.15517e-3
#define NRK 0.77
#define CC1 453.577
#define CC2 1.65014
#define CC3 -1.24814e-3
#define CC4 3.78201e-7
#define CC5 0.00
DEFINE_PROPERTY(density,cell,thread)
{
double P;
double T;
double m,at,ac;
double A,B;
double coef[4];
double a,b;
double density;
double test1,test2,test3,test4,test5;
double A1,B1,A2,B2;
double co,theta,root[3];
double zm,dd,al,all;
int i,j;
T=C_T(cell,thread);
P=C_P(cell,thread)+101325;
m=0.37464+1.54226*omiga-0.26992*pow(omiga,2);
at=pow(1+m*(pow(T/Tc,0.5)),2);
ac=0.45724*Rg*Rg*Tc*Tc/Pc;
b=0.0778*Rg*Tc/Pc;
a=ac*at;
A=a*P/pow(Rg*T,2);
B=b*P/(Rg*T);
coef[3]=-A*B+B*B+B*B*B;
coef[2]=A-2*B-3*B*B;
coef[1]=B-1;
coef[0]=1;
A1=(3*coef[2]-coef[1]*coef[1])/3;
B1=(2*pow(coef[1],3.0)-9*coef[1]*coef[2]+27*coef[3])/27;
test1=fabs(pow(A1,3)/27);
test2=pow(B1,2.0)/4;
if(A1<0&&test1>test2)
{
co=2*pow((-A1)/3,0.5);
theta=acos((3*B1)/(A1*co))/3.0;
root[0]=co*cos(theta)-coef[1]/3.0;
root[1]=co*cos(theta+2*PI/3)-coef[1]/3;
root[2]=co*cos(theta+4*PI/3)-coef[1]/3;
for(i=0;i<3;i++)
{
if(root[i]<0)root[i]=100000;
}
for(i=0;i<2;i++)
for(j=i+1;j<3;j++)
if(root[i]>root[j])
{
double temp=root[i];
root[i]=root[j];
root[j]=temp;
}
zm=root[2];
}
else
{
dd=sqrt(test2+pow(A1,3.0)/27);
al=1.0;
all=1.0;
test3=-B1/2+dd;
if(test3<0)al=-1;
test3=fabs(test3);
A2=al*pow(test3,0.3333334);
test4=-B1/2-dd;
if(test4<0)all=-1.0;
test4=fabs(test4);
B2=all*pow(test4,0.3333334);
zm=A2+B2-coef[1]/3;
if(test4>1e-4)
{
test5=fabs(1-fabs(A2/B2));
if(test5<5e-4)zm=-1*(A2+B2)/2-coef[1]/3;
}
}
zm=P/(zm*Rg*T);
density=1000*Mw*zm*1e-6;
return density;
}
提示的错误是最后一句“return density”————function returning float return double再一次感谢，请各位大师指点了
