May 17, 2024

 Mastering List Input in C++ A Comprehensive Guide

3 min read
how to input list in c++


C++ is a powerful programming language known for its versatility and performance. One of its fundamental data structures is the list, which allows storing and manipulating a collection of elements. In this article, we will explore the various techniques for inputting a list in C++. Whether you are a beginner or an experienced programmer, this comprehensive guide will provide you with valuable insights and strategies to effectively handle list inputs in your C++ programs.

Inputting a List with Known Size

When the size of the list is known in advance, you can use an array or a vector to input the elements. Arrays have a fixed size, while vectors are dynamic and can resize themselves automatically. Here’s how you can input a list using these approaches

  • Using Arrays Declare an array of the desired size and prompt the user to enter each element using a loop.
  • Using Vectors Declare a vector, and then read elements using a loop, pushing each element into the vector using the `push_back()` function.
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Inputting a List with Unknown Size

In scenarios where the size of the list is unknown, you can dynamically allocate memory to accommodate the user’s input. C++ provides a container called `std::list` that allows for dynamic resizing. Here’s how you can input a list with an unknown size

  • Using std list: Create an empty `std::list` object. Prompt the user to enter each element and append it to the list using the `push_back()` function. Continue until the user signals the end of the input.

Inputting a List from Command-Line Arguments

In some cases, you may want to pass a list as command-line arguments to your C++ program. This can be useful when automating tasks or when interacting with other programs. To input a list from command-line arguments, you can access the arguments passed to the `main()` function and parse them accordingly.

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Inputting a List from File

Inputting a list from a file is often useful when dealing with large datasets or when you want to store data persistently. C++ provides file input/output operations to handle such scenarios. To input a list from a file, you need to follow these steps

  • Open the file in read mode using the `ifstream` class.
  • Read the elements from the file using a loop until the end of the file is reached.
  • Store the elements in the desired list container, such as an array, vector, or std::list.

Frequently Asked Questions

How do I input a list in CPP?

The list insert( ) function is used to insert the elements in the list.

  • The function is used to insert the element at specified position.
  • The function is also used to insert the n No. of element in the list.
  • It is also used to insert the elements in the range at the specified.
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How do I append two lists in CPP?

List::merge() is an inbuilt function in C++ STL which is declared in <list> header file. merge() is used to merge two lists into one. We can simply just merge the two lists, or if we want extra comparisons we can also add a comparator.


Inputting a list is a common requirement in many C++ programs. Whether you know the size of the list in advance or not, there are various techniques available to handle list input efficiently. By following the strategies outlined in this article, you’ll be well-equipped to handle different list input scenarios in your C++ projects.

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