i cant get my collision detection to work

[Womble]

so far im trying to make a game where your trying to doge balls coming at you and for some reason using the same method
on 2 different balls for collision detection doesn't want to work and im wondering how could i get collision detection to work for multiple enemys

code:

setscreen ("graphics:800;600") var chars : array char of boolean var score, timealive : real var enemyreset : int var playerx, playery, circle_1_radius : int var enemyy1, enemyy2, circle_2_radius : int var enemyx1 : array 0 .. 10 of int var distance_between_centres : real %assigning values to the variables for the circules playerx := 700 playery := 300 circle_1_radius := 10 circle_2_radius := 10 enemyy1 := Rand.Int (20, 600) enemyy2 := Rand.Int (20, 600) enemyx1 (0) := 0 enemyx1 (1) := 0 score := 0 timealive := 0 enemyreset := 900 %main game loop     Input.KeyDown (chars)     % move character     if chars (KEY_RIGHT_ARROW) then         playery := playery + 5     end if     if chars (KEY_LEFT_ARROW) then         playery := playery - 5     end if     cls     %character     drawfilloval (playerx, playery, circle_1_radius, circle_2_radius, red)     %time alive     put "TIME: ", timealive ..     %score     put " SCORE: ", score ..     %enemy     drawfilloval (enemyx1 (0), enemyy1, circle_1_radius, circle_2_radius, blue)     drawfilloval (enemyx1 (1), enemyy2, circle_1_radius, circle_2_radius, brightblue)     %Checks if enemy has past the player and resets at the start     if enemyx1 (1) > enemyreset then         enemyx1 (1) := 0         enemyy2 := Rand.Int (20, 599)     end if     if enemyx1 (0) > enemyreset then         enemyx1 (0) := 0         enemyy1 := Rand.Int (20, 600)     end if     delay (20)     %moves the enemys     enemyx1 (0) := enemyx1 (0) + 3     enemyx1 (1) := enemyx1 (1) + 3     %calculate the distance between the centres of the circles     distance_between_centres := sqrt ((playerx - enemyx1 (0)) ** 2 + (playery - enemyy1) ** 2)     distance_between_centres := sqrt ((playerx - enemyx1 (1)) ** 2 + (playery - enemyy2) ** 2)     %checks if the player got hit     if distance_between_centres <= circle_1_radius + circle_2_radius then         put " You got hit"         exit     end if     %counts score     score := score + 5     %counts time alive     timealive := timealive + 0.02 end loop

[Insectoid]

distance_between_centres := sqrt ((playerx - enemyx1 (0)) ** 2 + (playery - enemyy1) ** 2)
distance_between_centres := sqrt ((playerx - enemyx1 (1)) ** 2 + (playery - enemyy2) ** 2)

What do you think these two lines are doing?