Square a Number
Programming Basics · C#
TASK
Problem
Given an integer `n`, output `n * n`. Print only the required answer; do not print prompts, labels, or debug text.
EXAMPLE
Example
12
144
LIMITS
Constraints
- Input is syntactically valid for the task except where invalid input is deliberately being tested (for example a `TryParse`/validation exercise). - Print only the required answer; do not add prompts, labels, debug text, or extra spaces/lines.
LEARN
Theory for this problem
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This is a direct arithmetic transformation. Name the input values, translate the formula exactly into C# operators, store the intermediate result when it improves readability, and print only the final value. For **Square a Number**, the concrete requirement is: Given an integer `n`, output `n * n`. Keep input parsing, the core operation, and output formatting separate so each part can be checked independently. Before coding, trace the first example by hand and identify the smallest valid or boundary-shaped input; this exposes off-by-one, sign, empty/single-element, and formatting mistakes before they reach the implementation.
NEED HELP?
Hints
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['This is a direct arithmetic transformation. Name the input values, translate the formula exactly into C# operators, store the intermediate result when it improves readability, and print only the final value.', 'Before coding, state this exact input-to-output rule: Given an integer `n`, output `n * n`.', 'Trace the public example by hand, then test the smallest input and the edge case most likely to change an index, branch, tie, or empty result.']
ANSWER
Solution
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using System;
class Program
{
static void Main()
{
long n=long.Parse(Console.ReadLine());
long result=n*n;
Console.WriteLine(result);
}
}