Unable to create multiple random numbers in c++

I am creating a game where a player encounters different objects which increase/decrease the health.

I have an array with the obj name and effect which works perfectly

The problem occurs in this loop

while(gHealth >= 0 && gHealth <= 500)
        {
            srand(time(0));

            int hitBy = (rand()%arrayL);  // arrayL = number objects in array

            cout << gName << " encountered " << objName [hitBy] << endl;
            gHealth += objPower[hitBy];
            cout << gName << "has a health of " << gHealth << endl;
        } 

Every time the player encounters same object. (what i mean is if the player encountered apple the first time then for the entire game he encounters apples)

How do i make random output each time it enters loop