Given three colors, such as R, G, and B, convert these RGB color to a hex color code. If the conversion is not possible, print -1.
Examples:
Input: R = 0, G = 0, B = 0
Output: #000000Input: R = 255, G = 255, B = 256
Output: -1
Explanation:
A 256 color code is not possible as only the 0-255 range is available for a color.
Approach:
- First, check if each of the given colors is in the range 0-255 or not.
- If not, then print -1 and exit the program as no conversion is possible in this case.
- If they are in range, then for each color, convert the given color code into its equivalent hexadecimal number.
- If the hexadecimal value is 1 digit, add 0 to the left to make it 2 digits.
- Then, in the final answer, add ‘#’ at the start, followed by the hexadecimal values of R, G, and B respectively.
Below is the implementation of the above approach.
C++
// C++ code to convert the given RGB // color code to Hex color code #include <iostream> using namespace std;
// function to convert decimal to hexadecimal string decToHexa( int n)
{ // char array to store hexadecimal number
char hexaDeciNum[2];
// counter for hexadecimal number array
int i = 0;
while (n != 0) {
// temporary variable to store remainder
int temp = 0;
// storing remainder in temp variable.
temp = n % 16;
// check if temp < 10
if (temp < 10) {
hexaDeciNum[i] = temp + 48;
i++;
}
else {
hexaDeciNum[i] = temp + 55;
i++;
}
n = n / 16;
}
string hexCode = "" ;
if (i == 2) {
hexCode.push_back(hexaDeciNum[0]);
hexCode.push_back(hexaDeciNum[1]);
}
else if (i == 1) {
hexCode = "0" ;
hexCode.push_back(hexaDeciNum[0]);
}
else if (i == 0)
hexCode = "00" ;
// Return the equivalent
// hexadecimal color code
return hexCode;
} // Function to convert the // RGB code to Hex color code string convertRGBtoHex( int R, int G, int B)
{ if ((R >= 0 && R <= 255)
&& (G >= 0 && G <= 255)
&& (B >= 0 && B <= 255)) {
string hexCode = "#" ;
hexCode += decToHexa(R);
hexCode += decToHexa(G);
hexCode += decToHexa(B);
return hexCode;
}
// The hex color code doesn't exist
else
return "-1" ;
} // Driver program to test above function int main()
{ int R = 0, G = 0, B = 0;
cout << convertRGBtoHex(R, G, B) << endl;
R = 255, G = 255, B = 255;
cout << convertRGBtoHex(R, G, B) << endl;
R = 25, G = 56, B = 123;
cout << convertRGBtoHex(R, G, B) << endl;
R = 2, G = 3, B = 4;
cout << convertRGBtoHex(R, G, B) << endl;
R = 255, G = 255, B = 256;
cout << convertRGBtoHex(R, G, B) << endl;
return 0;
} |
Java
// Java code to convert the given RGB // color code to Hex color code import java.util.*;
class GFG{
// function to convert decimal to hexadecimal static String decToHexa( int n)
{ // char array to store hexadecimal number
char []hexaDeciNum = new char [ 2 ];
// counter for hexadecimal number array
int i = 0 ;
while (n != 0 ) {
// temporary variable to store remainder
int temp = 0 ;
// storing remainder in temp variable.
temp = n % 16 ;
// check if temp < 10
if (temp < 10 ) {
hexaDeciNum[i] = ( char ) (temp + 48 );
i++;
}
else {
hexaDeciNum[i] = ( char ) (temp + 55 );
i++;
}
n = n / 16 ;
}
String hexCode = "" ;
if (i == 2 ) {
hexCode+=hexaDeciNum[ 0 ];
hexCode+=hexaDeciNum[ 1 ];
}
else if (i == 1 ) {
hexCode = "0" ;
hexCode+=hexaDeciNum[ 0 ];
}
else if (i == 0 )
hexCode = "00" ;
// Return the equivalent
// hexadecimal color code
return hexCode;
} // Function to convert the // RGB code to Hex color code static String convertRGBtoHex( int R, int G, int B)
{ if ((R >= 0 && R <= 255 )
&& (G >= 0 && G <= 255 )
&& (B >= 0 && B <= 255 )) {
String hexCode = "#" ;
hexCode += decToHexa(R);
hexCode += decToHexa(G);
hexCode += decToHexa(B);
return hexCode;
}
// The hex color code doesn't exist
else
return "-1" ;
} // Driver program to test above function public static void main(String[] args)
{ int R = 0 , G = 0 , B = 0 ;
System.out.print(convertRGBtoHex(R, G, B) + "\n" );
R = 255 ; G = 255 ; B = 255 ;
System.out.print(convertRGBtoHex(R, G, B) + "\n" );
R = 25 ; G = 56 ; B = 123 ;
System.out.print(convertRGBtoHex(R, G, B) + "\n" );
R = 2 ; G = 3 ; B = 4 ;
System.out.print(convertRGBtoHex(R, G, B) + "\n" );
R = 255 ; G = 255 ; B = 256 ;
System.out.print(convertRGBtoHex(R, G, B) + "\n" );
} } // This code is contributed by 29AjayKumar |
Python3
# Python3 program to convert the given # RGB color code to Hex color code # Function to convert decimal to hexadecimal def decToHexa(n):
# char array to store hexadecimal number
hexaDeciNum = [ '0' ] * 100
# Counter for hexadecimal number array
i = 0
while (n ! = 0 ):
# Temporary variable to store remainder
temp = 0
# Storing remainder in temp variable.
temp = n % 16
# Check if temp < 10
if (temp < 10 ):
hexaDeciNum[i] = chr (temp + 48 )
i = i + 1
else :
hexaDeciNum[i] = chr (temp + 55 )
i = i + 1
n = int (n / 16 )
hexCode = ""
if (i = = 2 ):
hexCode = hexCode + hexaDeciNum[ 0 ]
hexCode = hexCode + hexaDeciNum[ 1 ]
elif (i = = 1 ):
hexCode = "0"
hexCode = hexCode + hexaDeciNum[ 0 ]
elif (i = = 0 ):
hexCode = "00"
# Return the equivalent
# hexadecimal color code
return hexCode
# Function to convert the # RGB code to Hex color code def convertRGBtoHex(R, G, B):
if ((R > = 0 and R < = 255 ) and
(G > = 0 and G < = 255 ) and
(B > = 0 and B < = 255 )):
hexCode = "#" ;
hexCode = hexCode + decToHexa(R)
hexCode = hexCode + decToHexa(G)
hexCode = hexCode + decToHexa(B)
return hexCode
# The hex color code doesn't exist
else :
return "-1"
# Driver Code R = 0
G = 0
B = 0
print (convertRGBtoHex(R, G, B))
R = 255
G = 255
B = 255
print (convertRGBtoHex(R, G, B))
R = 25
G = 56
B = 123
print (convertRGBtoHex(R, G, B))
R = 2
G = 3
B = 4
print (convertRGBtoHex(R, G, B))
R = 255
G = 255
B = 256
print (convertRGBtoHex(R, G, B))
# This code is contributed by Pratik Basu |
C#
// C# code to convert the given RGB // color code to Hex color code using System;
class GFG{
// Function to convert decimal // to hexadecimal static string decToHexa( int n)
{ // char array to store
// hexadecimal number
char []hexaDeciNum = new char [2];
// Counter for hexadecimal
// number array
int i = 0;
while (n != 0)
{
// Temporary variable to
// store remainder
int temp = 0;
// Storing remainder in
// temp variable.
temp = n % 16;
// Check if temp < 10
if (temp < 10)
{
hexaDeciNum[i] = ( char ) (temp + 48);
i++;
}
else
{
hexaDeciNum[i] = ( char ) (temp + 55);
i++;
}
n = n / 16;
}
string hexCode = "" ;
if (i == 2)
{
hexCode += hexaDeciNum[0];
hexCode += hexaDeciNum[1];
}
else if (i == 1)
{
hexCode = "0" ;
hexCode += hexaDeciNum[0];
}
else if (i == 0)
hexCode = "00" ;
// Return the equivalent
// hexadecimal color code
return hexCode;
} // Function to convert the // RGB code to Hex color code static string convertRGBtoHex( int R, int G,
int B)
{ if ((R >= 0 && R <= 255) &&
(G >= 0 && G <= 255) &&
(B >= 0 && B <= 255))
{
string hexCode = "#" ;
hexCode += decToHexa(R);
hexCode += decToHexa(G);
hexCode += decToHexa(B);
return hexCode;
}
// The hex color code doesn't exist
else
return "-1" ;
} // Driver code public static void Main( string [] args)
{ int R = 0, G = 0, B = 0;
Console.Write(convertRGBtoHex(R, G, B) + "\n" );
R = 255; G = 255; B = 255;
Console.Write(convertRGBtoHex(R, G, B) + "\n" );
R = 25; G = 56; B = 123;
Console.Write(convertRGBtoHex(R, G, B) + "\n" );
R = 2; G = 3; B = 4;
Console.Write(convertRGBtoHex(R, G, B) + "\n" );
R = 255; G = 255; B = 256;
Console.Write(convertRGBtoHex(R, G, B) + "\n" );
} } // This code is contributed by rutvik_56 |
Javascript
<script> // Javascript code to convert the given RGB // color code to Hex color code // function to convert decimal to hexadecimal function decToHexa(n)
{ // char array to store hexadecimal number
let hexaDeciNum = Array.from({length: 2}, (_, i) => 0);
// counter for hexadecimal number array
let i = 0;
while (n != 0) {
// temporary variable to store remainder
let temp = 0;
// storing remainder in temp variable.
temp = n % 16;
// check if temp < 10
if (temp < 10) {
hexaDeciNum[i] = String.fromCharCode(temp + 48);
i++;
}
else {
hexaDeciNum[i] = String.fromCharCode(temp + 55);
i++;
}
n = Math.floor(n / 16);
}
let hexCode = "" ;
if (i == 2) {
hexCode+=hexaDeciNum[0];
hexCode+=hexaDeciNum[1];
}
else if (i == 1) {
hexCode = "0" ;
hexCode+=hexaDeciNum[0];
}
else if (i == 0)
hexCode = "00" ;
// Return the equivalent
// hexadecimal color code
return hexCode;
} // Function to convert the // RGB code to Hex color code function convertRGBtoHex(R, G, B)
{ if ((R >= 0 && R <= 255)
&& (G >= 0 && G <= 255)
&& (B >= 0 && B <= 255)) {
let hexCode = "#" ;
hexCode += decToHexa(R);
hexCode += decToHexa(G);
hexCode += decToHexa(B);
return hexCode;
}
// The hex color code doesn't exist
else
return "-1" ;
} // Driver Code let R = 0, G = 0, B = 0;
document.write(convertRGBtoHex(R, G, B) + "<br/>" );
R = 255; G = 255; B = 255;
document.write(convertRGBtoHex(R, G, B) + "<br/>" );
R = 25; G = 56; B = 123;
document.write(convertRGBtoHex(R, G, B) + "<br/>" );
R = 2; G = 3; B = 4;
document.write(convertRGBtoHex(R, G, B) + "<br/>" );
R = 255; G = 255; B = 256;
document.write(convertRGBtoHex(R, G, B) + "<br/>" );
</script> |
Output:
#000000 #FFFFFF #9183B7 #020304 -1
Time Complexity: O(log16N)
Auxiliary Space: O(1)