What to do for finding my require solution?

Question

1.00/5 (2 votes)

See more:

C++

#include <iostream>
#include <string>

int main() {
  std::string fullName;
  std::cout << "Type your full name: ";
  getline (std::cin, fullName);
  int n;
  std::cout<<"Enter which index(start from 0) word you want to change: ";
  std::cin>>n;
  std::cout<<"Enter what do you want to change in this index number "<<n<<":";
  std::cin >> fullName[n];
  std::cout << "Your name is: " << fullName;
  return 0;
}

What I have tried:

Answer:
Type your full name: Anika Tasnim
Enter which index(start from 0) word you want to change: 2
Enter what do you want to change in this index number 2:^[[3~
Your name is: Ana Tasnim

In this program, I want to omit characters from a string. So I take the index number from the user to which character to omit. But I mistakenly type DEL from the keyboard, after running the program I find indexes 2 and 3 characters were deleted. So my question is why does it happen? and What to do to delete index number 2?

Posted 21-Jun-22 3:00am

Fardin Khan_451

Updated 22-Jun-22 13:44pm

Rick York

v3

Add a Solution

Comments

Richard MacCutchan 21-Jun-22 11:34am

Your code works correctly. Whatever you typed at the keyboard should be reflected in the displayed name before your code processes it.

Rick York 21-Jun-22 20:26pm

I would be using a debugger to solve this problem. It should show you exactly what is going on.

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2022-06-21T05:21:00

The problem is that you are using Unicode, which uses a variable number of bytes to store a character: some will be one byte, some will be 2, and so on. Alphabetic characters are generally one byte, but DEL is likely to be several.
So reading a string into a string at an index is ... going to be problematic.
Instead, read your replacement string into a new instance of std::string then use string::substr - C++ Reference[^] to extract both the leading and tailing data from your original input and then assemble a new string from teh three new pieces:

input:             ABCDE
Replace at index:      2
Replacement:           X
Break input
   S1:                AB
   S2:                DE
New string = S1 + Replacement + S2
           = ABXDE

Rick York · Answer 2 · 2022-06-21T18:34:00

I believe this is the offending line.

C++

std::cin >> fullName[n];

The bitshift operator when used with std::cin expects a reference to a string and passing fullName[n] will copy the string you enter into the nth position and that copy will likely include the null character along with other character(s) you enter.

For debugging purposes I would display first character you enter as an integer and see if it is 127. It might be null instead, depending on the behavior of the bitshift operator with std::string. I don't know exactly because I rarely use cin and cout.

What to do for finding my require solution?

2 solutions

Solution 1

Solution 2

Add your solution here

Preview 0