Update docking.py

docking.py

@@ -21,9 +21,24 @@ def accel_grav(d):
 # Parameters
 r_init = 99*(10**6) # m distance away from planet during landing/docking stage ### Will have to change
 v0 = -7*10**5 # initial velocity (m/s) ### Will have to change
-m_mars = float(input("What it the mass of Mars?\n ____ x 10^23> ")) * 10**23 #6.39*(10**23) = mass of Mars (kg)
-r = float(input("What is the radius of Mars?\n____x 10^6> "))*10**6 #3.3895*(10**6) = radius of Mars (m)
-G = float(input("What is the gravitational constant G?\n ____x 10^-11> "))*10**-11 #6.67408*(10**-11)= gravitational constant
+input1 = float(input("What it the mass of Mars?\n ____ x 10^23> ")) #6.39*(10**23) = mass of Mars (kg)
+while input1!=6.39:
+    input1=float(input("Try again! What it the mass of Mars?\n ____ x 10^23> "))
+if input1==6.39:
+    print('Correct!')
+    m_mars=input1*(10**23)
+input2 = float(input("What is the radius of Mars?\n____x 10^6> ")) #3.3895*(10**6) = radius of Mars (m)
+while input2!=3.3895:
+    input2=float(input("Try again! What is the radius of Mars?\n____x 10^6> "))
+if input2==3.3895:
+    print('Correct!')
+    r=input2*(10**6)
+input3 = float(input("What is the gravitational constant G?\n ____x 10^-11> ")) #6.67408*(10**-11)= gravitational constant
+while input3!=6.67408:
+    input3=float(input("Try again! What is the gravitational constant G?\n ____x 10^-11> "))
+if input3==6.67408:
+    print('Correct!')
+    G=input3*(10**-11)
 F_thrust = 2*10**5 # kg*m/s^2 Reverse thrust of rocket ### Will Have to change constant
 v_ex = -4*10**(3) # m/s velocity of ejecting fuel ### Will have to change constant
 mass_fuel = MASS_FUEL