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horsena [70]
3 years ago
11

Which of the following statements opens the file info.txt for both input and output? a) dataFile.open("info.txt", ios::in &&

amp; ios::out); b) dataFile.open("info.txt", ios::in , ios::out); c) dataFile.open("info.txt", input || output); d) dataFile.open("info.txt", ios::in | ios::out);
Computers and Technology
2 answers:
torisob [31]3 years ago
6 0

Answer:

D

Explanation: Choice D

azamat3 years ago
3 0

Answer:

Correct answer is D

Explanation:

open is a function in c++ programming language used to interact with files.The function takes two parameters as input

  1. File name
  2. mode

File Name

File name is a string name of file to be opened.This is a compulsory parameter for open method.

Mode

Mode is an optional parameter in open function.Following are the accepted values of mode parameter

Prefix ios:: is added to start of each

  1. in (Open file in input mode for writing data to file)
  2. out (Open file in output / read-only mode to read data from file)
  3. binary (Open file in binary format)
  4. ate (Set the starting point of file to the end of file. Default starting point of file is start of file)
  5. "trunc" (If file is opened multiple times all previous data is replaced with new data)
  6. app (All operations of output are performed the end of file)

Use | operator to use multiple modes at a time.

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Fill in the code to complete the following method for checking whether a string is a palindrome. public static boolean isPalindr
Ilia_Sergeevich [38]

Answer:

(s.charAt(0) != s.charAt(s.length()-1))

Explanation:

public class Palindrome

{

public static void main(String[] args) {

   

    System.out.println(isPalindrome("car"));

    System.out.println(isPalindrome("carac"));

 

}

   public static boolean isPalindrome(String s) {

       if (s.length() <= 1)

           return true;

       else if (s.charAt(0) != s.charAt(s.length()-1))

           return false;

       else

           return isPalindrome(s.substring(1, s.length() - 1));

   }

}

You may see the whole code above with two test scenarios.

The part that needs to be filled is the base case that if the character at position 0 is not equal to the character at the last position in the string, that means the string is not a palindrome. (If this condition meets, it checks for the second and the one before the last position, and keeps checking)

4 0
3 years ago
Si la velocidad del sonido en el aire es de 330m/s , calcula la longitud De onda en metros, de una nota musical de frecuencia 55
omeli [17]

Answer: 3/5 or 0.6m

Explanation:

frecuencia (f) = 550Hz

velocidad del sonido en el aire (v) = 330m/s

velocidad =frecuencia × longitud De onda(λ)

v = fλ

330 = 550 × λ

λ = 330 / 550

λ = 3/5

λ = 0.6m

8 0
3 years ago
Indonesia is planning to move its capital from Jakarta to the island of Borneo in the hope that the burden of congestion, regula
JulijaS [17]

Answer:

Indonesia's capital has just been relocated from Jakarta to a site within the jungle of Kalimantan on Borneo island after parliament approved the bill. It will strengthen supply chains and place Indonesia "in a more strategic position in world trade routes, investment flows, and technological innovation."

Explanation:

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6 0
2 years ago
Read 2 more answers
Why does virtual reality rely on slightly different views for each eye?
GaryK [48]

Answer:

So, you can have a whole view, if you cover your right eye, you can't really see anything to your right just towards your left.

Explanation:

4 0
2 years ago
How should you complete the code A - valid = false B- valid = true
JulsSmile [24]

Answer:

A. for an if-else statement in python, if the condition is false, The else statement is executed.

B. if the condition of the if-statement is true, the indented block of code is executed.

Explanation:

The if-statement is a conditional statement in programming for decision making. It is also known as branching as it makes decisions based on two paths. It comes with another keyword called 'else'.

The If-else statement makes a decision based on the output of a condition which is defined in the if-statement. If the condition is met, the code block just after the if-statement is executed, but the else-statement block is executed if otherwise.

8 0
3 years ago
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