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3 years ago

4.2 lesson practice help plzs

Computers and Technology

1 answer:

sertanlavr [38]3 years ago

8 0

The output is 21 because c is incremented by 3 until it surpasses 10 and the value of c is added to sum each time the loop runs.

I hope this helps!

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3 years ago

Assume that name is a variable of type String that has been assigned a value. Write an expression whose value is a String contai

Stella [2.4K]

Corrected (Modified) Question:

i. Assume that name is a variable of type String that has been assigned a value. Write an expression whose value is a String containing the last character of the value of name. So if the value of name were "Smith" the expression's value would be "h".

ii. Given a String variable named sentence that has been initialized, write an expression whose value is the number of characters in the String referred to by sentence.

Explanation of the corrected question

The whole question has been numbered (i) and (ii) just to separate or divide it into clearer sub questions.

Some parts of the question has also been removed since they are repetition of a part of the question.

Answer:

(i) name.charAt(name.length() - 1)

(ii) sentence.length()

Explanation:

No language has been specified in the question for the code to be written in. However, I have chosen to write it in Java.

(i) In Java, to get a particular character in a string str, the function, charAt(x) is used, where x in the function represents the index of the character to be fetched. This is written as str.charAt(x).

In our case, x is the index of the last character in our string. To get the index of the last character in a string say str, the length of the string itself is used. However, indexing starts at zero. Therefore, to get the index, it will be the 1 subtracted from the length of the string as follows:

str.length() - 1

But note that, to get the length of a string, the method length() is used. For example if,

String str = "omobowale";

str.length() will return 9

Now to the question at hand, our string variable name is name.

Therefore to get its last character, we write:

name.charAt(name.length() - 1)

So if;

name = "Smith";

name.charAt(name.length() - 1) will return "h"

(ii) As explained in (i) above, to get the length (number of characters) of the variable string sentence, we simply write;

sentence.length()

PS: The length of a string is the number of characters present in the string.

Hope this helps!

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3 years ago

What is a relational database management system and how does it relate to a database administrator?

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4 years ago

Read three numbers from user input. Then, print the product of those numbers. Ex: If input is 2 3 5, output is 30. Note: Our sys

Murrr4er [49]

Answer:

This is written in Python 3. And I am assuming that since the output is "30", which is derived from the inputs 2, 3, and 5, these three are multiplied to get the final output.

fnum = int(input('Enter first number: '))

snum = int(input('Enter second number: '))

tnum = int(input('Enter third number: '))

output = (fnum * snum) * tnum

print ("The output is:", output)

Explanation:

For the first three lines, we ask the user to input 3 numbers. At the same time, we are also converting these inputs into int type.

fnum = int(input('Enter first number: '))
snum = int(input('Enter second number: '))
tnum = int(input('Enter third number: '))

The breakdown here is as follows:

fnum, snum, and tnum are user-defined variables which will hold the user's inputs.
int() is needed to define that everything inside it is an integer. If we don't first convert the input to integers, we will receive an error during multiplication saying that we cannot multiply non-int type variables. You can also choose to use Float here instead of Int - in which case, it will be float().
input('Enter first number:' )) - this is the part where we ask the user to enter the number they want.

Put together, it looks like this:

variable = int(input('Your Custom Text Here: '))

The next block would be:

output = (fnum * snum) * tnum

This is where we multiply the first, second, and third number to get to the output.

Finally, we print it with:

print ("The output is:", output)

Concatenating a string and variable looks like this.

print("text here", output) - when concatenating a string and a variable, simply add a comma after the quotation marks of the string.

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