Please check where did i go wrong..help me

void setup() 
{
  Serial.begin(9600);
}

void loop() {
    for (i=0; i >=0; i++)
    {
 VdcSensed[i] = analogRead(A0);
 IdcSensed[i] = analogRead(A1);
 VdcActual[i] = VdcSensed[i] * (5.0 / 1023.0);
 IdcActual[i] = IdcSensed[i] * (5.0 / 1023.0);
 Vdc[i] = 200 * VdcActual[i];
 Idc[i] = IdcActual[i] * (2000.0 / 411.2);  
 P[i] = Vdc[i] * Idc[i];
 deltaP[i] = (P[i] - P[i-1]);
  
  Serial.println(VdcSensed[i]);
  Serial.println(IdcSensed[i]);
  Serial.println(VdcActual[i]);
  Serial.println(IdcActual[i]);
  Serial.println(Vdc[i]);
  Serial.println(Idc[i]);
  Serial.println(P[i]);
  delay(5000);
    }
}

Moderator edit: CODE TAGS {{sob}}

What is this supposed to do?

    for (i=0; i >=0; i++)

This may help get you started.
You really have to explain what you are trying to do.
What kind of errors you are getting.

In fact, read:

void setup() 
{
  Serial.begin(9600);
}
float P;
float lastP=0.0;
void loop() {
 float VdcSensed = analogRead(A0);
 float IdcSensed = analogRead(A1);
 float VdcActual = VdcSensed * (5.0 / 1023.0);
 float IdcActual = IdcSensed * (5.0 / 1023.0);
 float Vdc = 200 * VdcActual;
 float Idc = IdcActual * (2000.0 / 411.2);  
 float P = Vdc * Idc;
 float deltaP = (P - lastP);
       lastP=P;
  Serial.println(VdcSensed);
  Serial.println(IdcSensed);
  Serial.println(VdcActual);
  Serial.println(IdcActual);
  Serial.println(Vdc);
  Serial.println(Idc);
  Serial.println(P);
  Serial.println(deltaP);
  Serial.println("");
  delay(5000);
}

Your loop will run indefinitely, or until it runs out of numbers.
You probably don't want to do this.

It is unnecessary, because the loop() function will operate over and over again anyway.

Where did you go wrong?
You posted the same incomplete code twice, without tags.
I've deleted one of the posts, and put code tags in the other.