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我写了代码，但在输出函数代码的第3行中，我一直得到第3行：错误：预期表达式以下是代码

double  Ppv,deltaD,D2; 
deltaD = 0.01;
 if ((DeltaVpv!=0){
    if ((DeltaIpv/DeltaVpv)>(-Ipv/Vpv)){
    D2 = PREV_D - deltaD;
    }
    else if ((DeltaIpv/DeltaVpv)<(-Ipv/Vpv)){
      D2 = PREV_D + deltaD;
      }
      }
      else if (DeltaVpv==0){
        if (DeltaIpv!=0){
        D2 = PREV_D + deltaD;
        }
}
if (D2>1){
 D=1;
 else 
    if (D2<0){
    D=0;
    else 
     D=D2;
 
THESE ARE MY OTHER CODE 

CODE DECLARATIONS
#include    <math.h>
double Ppv,deltaD,D2;
double Vpv=0.0;
double Ipv=0.0;
 double DeltaVpv=300;
 double DeltaIpv=38;
 #define Vpv InputSignal(0,0)
#define Ipv InputSignal(0,1)
#define D OutputSignal(0,0)
#define PREV_D DiscState(0)
#define PREV_P DiscState(1)
#define PREV_V DiscState(2)
#define PREV_I DiscState(3)
#define DeltaVpv =Vpv-PREV_V;
#define DeltaIpv =Ipv-PREV_I;

START FUNCTION CODE
PREV_D = 0.366;
PREV_V = 38 ;
PREV_P = 290;
PREV_I= 8.5;

UPDATE FUNCTION CODE
PREV_D = D;
PREV_V = Vpv;
PREV_I = Ipv;
PREV_P = Vpv*Ipv;

我是C编程新手，所以我不知道问题出在哪里。附件是我所遵循的流程图。enter image description here