- C++ Programming Examples
- C++ Programming Examples
- C++: Hello World
- C++: Get Input
- C++: Print Integer
- C++: Add two numbers
- C++: Add, Sub, Multiply, Div
- C++: Add Digits
- C++: Find Average and Percentage
- C++: Find Arithmetic Mean
- C++: Sum of n Natural Numbers
- C++: Sum of n Numbers
- C++: Square's Area and Perimeter
- C++: Rectangle's Area and Perimeter
- C++: Triangle's Area and Perimeter
- C++: Area and Circumference
- C++: Find Simple Interest
- C++: Fahrenheit to Celsius
- C++: Celsius to Fahrenheit
- C++: Print Prime Numbers
- C++: Reverse a Number
- C++: Swap Two Numbers
- C++: Print Multiplication Table
- C++: Find Factorial of a Number
- C++: Find Factors of a Number
- C++: Find HCF and LCM
- C++: Create a Calculator
- C++: Count Digits in a Number
- C++: First and Last Digit Sum
- C++: Product of Number Digits
- C++: Sum of Squares of Digits
- C++: Interchange Digits of Number
- C++ if-else Programs
- C++: Check Even or Odd
- C++: Check Prime or Not
- C++: Check Alphabet or Not
- C++: Check Vowel or Not
- C++: Check Leap Year or Not
- C++: Check Reverse equals Original
- C++: Check Perfect Number
- C++: Check Palindrome or Not
- C++: Check Armstrong or Not
- C++: Divisibility Test
- C++: Find Labor Wage
- C++: Find Discounted Price
- C++: Find Shipping Charge
- C++: Find Telephone Bills
- C++: Calculate Student Grade
- C++: Largest of Two Numbers
- C++: Largest of Three Numbers
- C++ Number Conversion
- C++: Decimal to Binary
- C++: Decimal to Octal
- C++: Decimal to Hexadecimal
- C++: Binary to Decimal
- C++: Binary to Octal
- C++: Binary to Hexadecimal
- C++: Octal to Decimal
- C++: Octal to Binary
- C++: Octal to Hexadecimal
- C++: Hexadecimal to Decimal
- C++: Hexadecimal to Binary
- C++: Hexadecimal to Octal
- C++ Pattern Programs
- C++: Pattern Programs
- C++: Print Diamond Pattern
- C++: Print Floyd's Triangle
- C++: Print Pascal's Triangle
- C++ Array Programs
- C++: 1D Array Program
- C++: Linear Search
- C++: Binary Search
- C++: Largest Element in an Array
- C++: Smallest Element in an Array
- C++: Find Second Largest Element
- C++: Find Second Smallest Element
- C++: Sum of All Elements
- C++: Multiply All Elements
- C++: Element in Even Position
- C++: Element in Odd Position
- C++: Print Even Numbers in Array
- C++: Print Odd Numbers in Array
- C++: Count Even or Odd Numbers
- C++: Sum of Even or Odd Numbers
- C++: Count Positive, Negative, Zero
- C++: Reverse an Array
- C++: Insert an Element
- C++: Delete an Element
- C++: Merge two Arrays
- C++: Bubble Sort
- C++: Selection Sort
- C++: Insertion Sort
- C++: Common Elements
- C++: 2D Array Programs
- C++: Add Two Matrices
- C++: Subtract Two Matrices
- C++: Transpose Matrix
- C++: Multiply Two Matrices
- C++: 3D Array Programs
- C++ String Programs
- C++: Print String
- C++: Find String Length
- C++: Compare Two Strings
- C++: Copy String
- C++: String Concatenation
- C++: Reverse a String
- C++: Delete Vowels from a String
- C++: Delete a Word from a String
- C++: Count Characters in a String
- C++: Count Words in a String
- C++: Frequency of Words
- C++: Remove Spaces from Strings
- C++: Sort a String
- C++: Uppercase to Lowercase
- C++: Lowercase to Uppercase
- C++: Swap Two Strings
- C++: Check the Anagram or Not
- C++: Capitalize All Words in a String
- C++: Get Numbers from a String
- C++ File Programs
- C++: Read a File
- C++: Write Content to a File
- C++: Append Data to a File
- C++: Read and Display File
- C++: Copy a File
- C++: Merge Two Files
- Count Characters in a File
- C++: Capitalize Every Word
- C++: List Files in Directory
- C++: Delete a File
- C++: Encrypt and Decrypt a File
- C++ Misc Programs
- C++: Print ASCII Value
- C++: Add Binary Numbers
- C++: Generate Random Numbers
- C++: Print a Smiling Face
- C++: Days into Years and Months
- C++: Add Two Numbers using Pointer
- C++: Print Fibonacci Series
- C++: Generate Armstrong Numbers
- C++: Find nCr and nPr
- C++: Get IP Address
- C++: Print Date and Time
- C++: Shutdown and Restart Computer
- C++ Programming Tutorial
- C++ Tutorial
C++ Program to Convert Decimal to Hexadecimal
In this article, you will learn and get code on decimal to hexadecimal conversion in C++. The decimal to hexadecimal conversion program in C++ is created here using the following approaches:
- Without Using a Function, Convert Decimal to Hexadecimal
- Using a Function, Convert Decimal to Hexadecimal
But before going through these programs, if you are not aware of some simple steps used for the conversion, then you can refer to Decimal to Hexadecimal to get all the things you need.
Decimal to Hexadecimal in C++
To convert a number from decimal to hexadecimal in C++ programming, you have to ask the user to enter the desired decimal number first. and then convert it into its equivalent hexadecimal value. Finally, print its equivalent hexadecimal value on the output as shown in the program given below.
The question is: write a program in C++ to receive a decimal number and print its equivalent value in hexadecimal. The answer to this question is given below:
#include<iostream> using namespace std; int main() { int decimalNum, rem, i=0; char hexaDecimalNum[50]; cout<<"Enter the Decimal Number: "; cin>>decimalNum; while(decimalNum!=0) { rem = decimalNum%16; if(rem<10) rem = rem+48; else rem = rem+55; hexaDecimalNum[i] = rem; i++; decimalNum = decimalNum/16; } cout<<"\nEquivalent Hexadecimal Value: "; for(i=i-1; i>=0; i--) cout<<hexaDecimalNum[i]; cout<<endl; return 0; }
This program was built and runs under the Code::Blocks IDE. Here is its sample run:
Now enter the input, say 259 (a decimal number), and press the ENTER key to convert and print its equivalent value in hexadecimal as shown in the snapshot given below:
The following is the output of a dry run of the above program with user input of 259 (a decimal number):
- Initial value, i=0
- When the user enters the decimal number input, say 259, then it gets stored in the decimalNum variable. So decimalNum=259
- Now the condition of the while loop gets evaluated.
- That is, the condition decimalNum!=0 or 259!=0 evaluates to be true, therefore program flow goes inside the loop.
- decimalNum%16 or 259%16 or 3 is set to rem. So rem=3
- Now the condition rem<10 or 3<10 evaluates to be true, therefore program flow goes inside
the if's body and the statement
rem = rem+48;
gets evaluated - That is, rem+48 or 3+48 or 51 gets initialized to rem. So rem=51
- else's body is skipped because the condition of if evaluates to true.
- Now the value of rem (51) gets initialized to hexaDecimalNum[i] or hexaDecimalNum[0].
- The value of i gets incremented. Now i=1
- And then decimalNum/16 or 259/16 or 16 gets initialized to decimalNum. So decimalNum=16
- Now program flow goes back and evaluates the condition of the while loop again with a new value of decimalNum (16).
- Again, the condition evaluates to be true, so the program flow again goes inside the loop.
- decimalNum%16 or 16%16 or 0 is assigned to rem.
- Again the if's condition rem<10 or 0<10 evaluates to be true, therefore rem+48 or 0+48 or 48 gets initialized to rem. Now rem=0
- rem or 0 is set to hexaDecimalNum[i] or hexaDecimalNum[1]. So hexaDecimalNum[1]=0
- Again, the value of i gets incremented. So i=2
- decimalNum/16 or 1 is set to decimalNum.
- Continue the process until the condition of the while loop evaluates to be false.
- If we continue the process, the value of rem will be 51, 48, and 49 which will be initialized to hexaDecimalNum[0], hexaDecimalNum[1], and hexaDecimalNum[2].
- Print the hexaDecimalNum[] value from the last to the 0th index.
- Because 51, 48, and 49 are ASCII values of 3, 0, and 1, respectively. Therefore, in reverse order, 103 gets printed using the for loop. That is the equivalent hexadecimal value of the given decimal number (that was 259).
Note: If the value of rem (the remainder) is greater than or equal to 10, then the equivalent hexadecimal alphabet's ASCII value (A-F) gets assigned. That is, A for 10, B for 11, C for 12, and so on.
From 1 to 20, convert decimal to hexadecimal
This program converts all the decimal numbers from 1 to 20 into their equivalent hexadecimal values without asking for user input.
#include<iostream> using namespace std; int main() { int decimalNum, rem, i, k; char hexaDecimalNum[50]; cout<<"Decimal Number\tHexadecimal Number\n"; for(k=1; k<=20; k++) { decimalNum=k; i=0; while(decimalNum!=0) { rem = decimalNum%16; if(rem<10) rem = rem+48; else rem = rem+55; hexaDecimalNum[i] = rem; i++; decimalNum = decimalNum/16; } cout<<k<<"\t\t"; for(i=i-1; i>=0; i--) cout<<hexaDecimalNum[i]; cout<<endl; } return 0; }
Here is its sample output:
Decimal to hexadecimal conversion in C++, using function
Let's create the same-purpose program using the user-defined function DecToHexDec(). This function converts a decimal number to hexadecimal.
#include<iostream> using namespace std; int DecToHexDec(int dec, int); char hexaDecNum[50]; int main() { int decimalNum, i; cout<<"Enter the Decimal Number: "; cin>>decimalNum; i = DecToHexDec(decimalNum, 0); cout<<"\nEquivalent Hexadecimal Value: "; for(i=i-1; i>=0; i--) cout<<hexaDecNum[i]; cout<<endl; return 0; } int DecToHexDec(int dec, int i) { int rem; while(dec!=0) { rem = dec%16; if(rem<10) rem = rem+48; else rem = rem+55; hexaDecNum[i] = rem; i++; dec = dec/16; } return i; }
Here is a sample run with 364 as a decimal number as user input:
The same program in different languages
- C Decimal to Hexadecimal Conversion
- Java Decimal to Hexadecimal Conversion
- Python Decimal to Hexadecimal Conversion
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