Answer:
2. <em>A reference of type A can be treated as a reference of type B</em> - False
Base class or its objects are not related to their derived class (or its objects).
Explanation:
class A {
int a;
public A() {
a = 7;
}
}
class B extends A {
int b;
public B() {
b = 8;
}
}
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1. <em>After the constructor for class B executes, the variable a will have the value 7 </em>- True.
When an object of a derived class is declared, the constructor of base class is called before the constructor of derived class (is called).
3. <em>Both variables a and b are instance variables </em>- True.
Classes can have instance, or member, variables and methods.
4.<em> After the constructor for class B executes, the variable b will have the value 8</em> - True.
When object of class B is declared, its constructor was called, which initialized variable b to 8.
Answer:
#here is code in python.
#read number of shares
num_share = int(input("Enter number of shares:"))
#read purchase price
buy_p = float(input("Enter purchase price:"))
#read sell price
sell_p = float(input("Enter sale price:"))
#total buying cost
buy_cost=buy_p*1.03*num_share
#total selling cost
sell_cost=sell_p*0.97*num_share
#if net profit
if(sell_cost>buy_cost):
print("After the transaction, you made " +str(sell_cost-buy_cost)+ " dollars.")
#if net loss
else:
print("After the transaction, you lost " +str(buy_cost-sell_cost)+ " dollars.")
Explanation:
Read the total number of shares from user.Then read buying price of a share and selling price of a share.Then calculate total buying cost including commission.Calculate total selling cost excluding the commission.If total buying cost is greater than total selling cost the print the profit else print the loss in the transaction.
Output:
Enter number of shares:10
Enter purchase price:10
Enter sale price:10
After the transaction, you lost 6.0 dollars.
Answer: Wow that's really cool!
Answer:
Here is the Python program:
COOKIES_PER_BAG = 40 #sets constant value for bag of cookies
SERVINGS_PER_BAG = 10 #sets constant value for serving in bag
CALORIES_PER_SERVING = 300 #sets constant value servings per bag
cookies = int(input("How many cookies did you eat? ")) #prompts user to input how many cookies he or she ate
totalCalories = cookies * (CALORIES_PER_SERVING / (COOKIES_PER_BAG / SERVINGS_PER_BAG)); #computes total calories consumed by user
print("Total calories consumed:",totalCalories) #displays the computed value of totalCalories consumed
Explanation:
The algorithm is:
- Start
- Declare constants COOKIES_PER_BAG, SERVINGS_PER_BAG and CALORIES_PER_SERVING
- Set COOKIES_PER_BAG to 40
- Set SERVINGS_PER_BAG to 10
- Set CALORIES_PER_SERVING to 300
- Input cookies
- Calculate totalCalories: totalCalories ← cookies * (CALORIES_PER_SERVING / (COOKIES_PER_BAG / SERVINGS_PER_BAG))
- Display totalCalories
I will explain the program with an example:
Lets say user enters 5 as cookies he or she ate so
cookies = 5
Now total calories are computed as:
totalCalories = cookies * (CALORIES_PER_SERVING / (COOKIES_PER_BAG / SERVINGS_PER_BAG));
This becomes:
totalCalories = 5 * (300/40/10)
totalCalories = 5 * (300/4)
totalCalories = 5 * 75
totalCalories = 375
The screenshot of program along with its output is attached.
Answer: The most important characteristic for the development of a civilization is the presence of advanced cities because they were centers of trade, which established economies and allowed for further development of the civilizations.
Explanation:
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