Given three numbers R, G and B as the color code for Red, Green and Blue respectively as in the form of RGB color code. The task is to know whether the given color code is valid or not.
RGB Format: The RGB(Red, Green, Blue) format is used to define the color of an HTML element by specifying the R, G, B values range between 0 to 255. For example: RGB value of Red color is (255, 0, 0), Green color is (0, 255, 0), Blue color is (0, 0, 255) etc.
color: rgb(R, G, B);
Note: The color code is valid when all numbers are in the range [0, 255].
Examples:
Input: R=0, G=100, B=255
Output: True
Explanation: Every color is in range [0, 255]Input: R=0, G=200, B=355
Output: False
Explanation: Blue is not in range [0, 255]
Approach: To check if the color code is valid or not we need to check if each of the color is in the range [0, 255] or not. If any of the color is not in this range, return false, else return true.
Below is the implementation of the approach:
C++
#include <iostream>using namespace std;// Function to check validity// of the color codebool isValidRGB(int R, int G, int B){ if (R < 0 || R > 255) return false; else if (G < 0 || G > 255) return false; else if (B < 0 || B > 255) return false; else return true;}// Driver codeint main(){ int R, G, B; // Check if rgb(0, 0, 0) is valid or not R = 0, G = 0, B = 0; (isValidRGB(R, G, B)) ? cout << "true\n" : cout << "false\n"; // Check if rgb(0, 100, 255) is valid or not R = 0, G = 100, B = 255; (isValidRGB(R, G, B)) ? cout << "true\n" : cout << "false\n"; // Check if rgb(0, 200, 355) is valid or not R = 0, G = 200, B = 355; (isValidRGB(R, G, B)) ? cout << "true\n" : cout << "false\n"; // Check if rgb(-100, 0, 255) is valid or not R = -100, G = 0, B = 255; (isValidRGB(R, G, B)) ? cout << "true\n" : cout << "false\n"; return 0;} |
Java
class GFG { // Function to check validity // of the color code public static boolean isValidRGB(int R, int G, int B) { if (R < 0 || R > 255) return false; else if (G < 0 || G > 255) return false; else if (B < 0 || B > 255) return false; else return true; } // Driver code public static void main(String args[]) { int R, G, B; // Check if rgb(0, 0, 0) is valid or not R = 0; G = 0; B = 0; if (isValidRGB(R, G, B)) System.out.println("true"); else System.out.println("false"); // Check if rgb(0, 100, 255) is valid or not R = 0; G = 100; B = 255; if (isValidRGB(R, G, B)) System.out.println("true"); else System.out.println("false"); // Check if rgb(0, 200, 355) is valid or not R = 0; G = 200; B = 355; if (isValidRGB(R, G, B)) System.out.println("true"); else System.out.println("false"); // Check if rgb(-100, 0, 255) is valid or not R = -100; G = 0; B = 255; if (isValidRGB(R, G, B)) System.out.println("true"); else System.out.println("false"); }}// This code is contributed by saurabh_jaiswal |
Python3
# Function to check validity# of the color codedef isValidRGB(R, G, B) : if (R < 0 or R > 255) : return False; elif (G < 0 or G > 255) : return False; elif (B < 0 or B > 255) : return False; else : return True;# Driver codeif __name__ == "__main__" : # Check if rgb(0, 0, 0) is valid or not R = 0; G = 0; B = 0; if isValidRGB(R, G, B) : print("true") else : print("false") # Check if rgb(0, 100, 255) is valid or not R = 0; G = 100; B = 255; if isValidRGB(R, G, B) : print("true") else : print("false") # Check if rgb(0, 200, 355) is valid or not R = 0; G = 200; B = 355; if isValidRGB(R, G, B) : print("true") else : print("false") # Check if rgb(-100, 0, 255) is valid or not R = -100; G = 0; B = 255; if isValidRGB(R, G, B) : print("true") else : print("false") # This code is contributed by AnkThon |
C#
using System;public class GFG { // Function to check validity // of the color code public static bool isValidRGB(int R, int G, int B) { if (R < 0 || R > 255) return false; else if (G < 0 || G > 255) return false; else if (B < 0 || B > 255) return false; else return true; } // Driver code public static void Main(string []args) { int R, G, B; // Check if rgb(0, 0, 0) is valid or not R = 0; G = 0; B = 0; if (isValidRGB(R, G, B)) Console.WriteLine("true"); else Console.WriteLine("false"); // Check if rgb(0, 100, 255) is valid or not R = 0; G = 100; B = 255; if (isValidRGB(R, G, B)) Console.WriteLine("true"); else Console.WriteLine("false"); // Check if rgb(0, 200, 355) is valid or not R = 0; G = 200; B = 355; if (isValidRGB(R, G, B)) Console.WriteLine("true"); else Console.WriteLine("false"); // Check if rgb(-100, 0, 255) is valid or not R = -100; G = 0; B = 255; if (isValidRGB(R, G, B)) Console.WriteLine("true"); else Console.WriteLine("false"); }}// This code is contributed by AnkThon |
Javascript
<script> // Function to check validity // of the color code const isValidRGB = (R, G, B) => { if (R < 0 || R > 255) return false; else if (G < 0 || G > 255) return false; else if (B < 0 || B > 255) return false; else return true; } // Driver code let R, G, B; // Check if rgb(0, 0, 0) is valid or not R = 0, G = 0, B = 0; (isValidRGB(R, G, B)) ? document.write("true<br/>") : document.write("false<br/>"); // Check if rgb(0, 100, 255) is valid or not R = 0, G = 100, B = 255; (isValidRGB(R, G, B)) ? document.write("true<br/>") : document.write("false<br/>"); // Check if rgb(0, 200, 355) is valid or not R = 0, G = 200, B = 355; (isValidRGB(R, G, B)) ? document.write("true<br/>") : document.write("false<br/>"); // Check if rgb(-100, 0, 255) is valid or not R = -100, G = 0, B = 255; (isValidRGB(R, G, B)) ? document.write("true<br/>") : document.write("false<br/>"); // This code is contributed by rakeshsahni</script> |
Output
true true false false
Time Complexity: O(1)
Auxiliary Space: O(1)
Approach 2: Using Regular Expression:
- This approach uses regular expressions to match valid RGB color codes.
- The regular expression pattern ^rgb\((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\)$ matches a string that starts with “rgb(“, followed by three comma-separated integers (each representing a color component), and ends with “)”.
- The integers are matched using regex character classes to ensure that they are between 0 and 255 (inclusive).
- The \s* in between the commas and integers matches any whitespace characters (including none) between them. The ^ and $ at the beginning and end of the pattern ensure that the entire string is matched, i.e., there are no extraneous characters before or after the color code.
Here is the code of above approach:
C++
#include <iostream>#include <regex>using namespace std;// Function to check validity of the color codebool isValidRGB(string colorCode) { // Regular expression to match valid RGB color codes regex pattern("^rgb\\((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\)$"); // Check if the color code matches the pattern return regex_match(colorCode, pattern);}// Driver codeint main() { // Check if rgb(0, 0, 0) is valid or not string colorCode = "rgb(0, 0, 0)"; (isValidRGB(colorCode)) ? cout << "true\n" : cout << "false\n"; // Check if rgb(0, 100, 255) is valid or not colorCode = "rgb(0, 100, 255)"; (isValidRGB(colorCode)) ? cout << "true\n" : cout << "false\n"; // Check if rgb(0, 200, 355) is valid or not colorCode = "rgb(0, 200, 355)"; (isValidRGB(colorCode)) ? cout << "true\n" : cout << "false\n"; // Check if rgb(-100, 0, 255) is valid or not colorCode = "rgb(-100, 0, 255)"; (isValidRGB(colorCode)) ? cout << "true\n" : cout << "false\n"; return 0;} |
Java
import java.util.regex.*;public class GFG { // Function to check validity of the color code public static boolean isValidRGB(String colorCode) { // Regular expression to match valid RGB color codes String pattern = "^rgb\\((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\)$"; // Create a Pattern object Pattern regexPattern = Pattern.compile(pattern); // Create a Matcher object Matcher matcher = regexPattern.matcher(colorCode); // Check if the color code matches the pattern return matcher.matches(); } // Driver code public static void main(String[] args) { // Check if rgb(0, 0, 0) is valid or not String colorCode = "rgb(0, 0, 0)"; System.out.println(isValidRGB(colorCode)); // Check if rgb(0, 100, 255) is valid or not colorCode = "rgb(0, 100, 255)"; System.out.println(isValidRGB(colorCode)); // Check if rgb(0, 200, 355) is valid or not colorCode = "rgb(0, 200, 355)"; System.out.println(isValidRGB(colorCode)); // Check if rgb(-100, 0, 255) is valid or not colorCode = "rgb(-100, 0, 255)"; System.out.println(isValidRGB(colorCode)); }}// This code is contributed by Taranpreet Singh. |
Python3
import re# Function to check validity of the color codedef is_valid_rgb(color_code): # Regular expression to match valid RGB color codes pattern = r'^rgb\((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\)$' # Check if the color code matches the pattern return re.match(pattern, color_code) is not None# Driver codeif __name__ == "__main__": # Check if rgb(0, 0, 0) is valid or not color_code = "rgb(0, 0, 0)" print("true" if is_valid_rgb(color_code) else "false") # Check if rgb(0, 100, 255) is valid or not color_code = "rgb(0, 100, 255)" print("true" if is_valid_rgb(color_code) else "false") # Check if rgb(0, 200, 355) is valid or not color_code = "rgb(0, 200, 355)" print("true" if is_valid_rgb(color_code) else "false") # Check if rgb(-100, 0, 255) is valid or not color_code = "rgb(-100, 0, 255)" print("true" if is_valid_rgb(color_code) else "false")# This code is contributed by Taranpreet Singh. |
C#
using System;using System.Text.RegularExpressions;public class GFG { // Function to check the validity of the color code public static bool IsValidRGB(string colorCode) { // Regular expression to match valid RGB color codes Regex pattern = new Regex( @"^rgb\((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\)$"); // Check if the color code matches the pattern return pattern.IsMatch(colorCode); } public static void Main() { // Check if rgb(0, 0, 0) is valid or not string colorCode = "rgb(0, 0, 0)"; Console.WriteLine(IsValidRGB(colorCode)); // Check if rgb(0, 100, 255) is valid or not colorCode = "rgb(0, 100, 255)"; Console.WriteLine(IsValidRGB(colorCode)); // Check if rgb(0, 200, 355) is valid or not colorCode = "rgb(0, 200, 355)"; Console.WriteLine(IsValidRGB(colorCode)); // Check if rgb(-100, 0, 255) is valid or not colorCode = "rgb(-100, 0, 255)"; Console.WriteLine(IsValidRGB(colorCode)); }} |
Output
true true false false
Time Complexity: O(1)
Auxiliary Space: O(1)
Feeling lost in the world of random DSA topics, wasting time without progress? It’s time for a change! Join our DSA course, where we’ll guide you on an exciting journey to master DSA efficiently and on schedule.
Ready to dive in? Explore our Free Demo Content and join our DSA course, trusted by over 100,000 neveropen!
Ready to dive in? Explore our Free Demo Content and join our DSA course, trusted by over 100,000 neveropen!
