C++ String Access Ops: Assign Size of UserInput

  • C/C++
  • Thread starter ineedhelpnow
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    C++ String
In summary, to assign a specific size to a user input string in C++, you can use the resize() function from the string library. This function takes in the desired size as a parameter and truncates or adds characters to the string to match the size. If the user input is longer than the assigned size, the function will truncate the string to match the size. You can also use resize() again to change the size of a user input string, but this will also truncate or add characters to match the new size. To check the size of a user input string, you can use the size() function from the string library, which returns an integer representing the number of characters in the string. If the assigned size is smaller than the actual
  • #1
ineedhelpnow
651
0
Assign the size of userInput to stringSize. Ex: if userInput = "Hello", output is:
Size of userInput: 5Sample program:

Code:
#include <iostream>
#include <string>
using namespace std;

int main() {
   string userInput;
   int stringSize = 0;

   userInput = "Hello"; 
   <STUDENT CODE>

   cout << "Size of userInput: " << stringSize << endl;

   return 0;
}

help! i figured i have to use the function size() but not sure how in this case.
 
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  • #2
Here is a sample program showing how to use the [m]size()[/m] function:

Code:
// string::size
#include <iostream>
#include <string>

int main ()
{
  std::string str ("Test string");
  std::cout << "The size of str is " << str.size() << " bytes.\n";
  return 0;
}
 

1. How do I assign a size to a user input in C++?

You can use the resize() function from the string library to assign a specific size to a user input string. This function takes in the desired size as a parameter and truncates or adds characters to the string to match the size.

2. What happens if the user input is longer than the assigned size?

If the user input is longer than the assigned size, the resize() function will truncate the string to match the size. This means that any characters beyond the assigned size will be removed from the string.

3. Can I change the size of a user input string after it has been assigned?

Yes, you can use the resize() function again to change the size of a user input string after it has been assigned. Keep in mind that this will also truncate or add characters to the string to match the new size.

4. Is there a way to check the size of a user input string in C++?

Yes, you can use the size() function from the string library to get the current size of a string. This function returns an integer value representing the number of characters in the string.

5. What happens if the assigned size is smaller than the actual size of the user input?

If the assigned size is smaller than the actual size of the user input, the resize() function will truncate the string to match the size. This means that any characters beyond the assigned size will be removed from the string. It is important to ensure that the assigned size is large enough to hold the entire user input string to avoid data loss.

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