- 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 Hexadecimal to Octal
In this article, you will learn about and get code for hexadecimal to octal conversion in C++. The program is written both with and without the use of functions.
Before going through the program, if you're not aware of the simple steps and formula used for the conversion, you can refer to the hexadecimal to octal steps and formula to get all the required information.
Hexadecimal to Octal in C++
To convert a hexadecimal number to an octal number in C++ programming, you have to ask the user to enter the hexadecimal number first. And then convert it into its equivalent octal value. Print its equivalent octal value as shown in the program given below:
#include<iostream> #include<math.h> using namespace std; int main() { int decimalNum=0, octalNum[30], rem, i=0, len=0; char hexDecNum[10]; cout<<"Enter the Hexadecimal Number: "; cin>>hexDecNum; while(hexDecNum[i]!='\0') { len++; i++; } len--; i=0; while(len>=0) { rem = hexDecNum[len]; if(rem>=48 && rem<=57) rem = rem-48; else if(rem>=65 && rem<=70) rem = rem-55; else if(rem>=97 && rem<=102) rem = rem-87; else { cout<<"\nInvalid Hex Digit!"; cout<<endl; return 0; } decimalNum = decimalNum + (rem*pow(16, i)); len--; i++; } i=0; while(decimalNum != 0) { octalNum[i] = decimalNum%8; i++; decimalNum = decimalNum/8; } cout<<"\nEquivalent Octal Value: "; for(i=(i-1); i>=0; i--) cout<<octalNum[i]; cout<<endl; return 0; }
This program was build and run under Code::Blocks IDE. Here is its sample run:
Now supply the hexadecimal number input, say 4CA, and press the ENTER key to convert, which prints its equivalent octal value as shown in the output given below:
Here is another sample run with an invalid hexadecimal input, say 4RT:
Note: There is no direct conversion from hexadecimal to octal. So you can either prefer hexadecimal to decimal, then decimal to octal, or hexadecimal to binary, then binary to octal.
The above program first converts a hexadecimal number to its decimal equivalent, and then the decimal equivalent gets converted into its octal equivalent. Therefore, indirectly, the hexadecimal number (entered by the user) gets converted into its octal equivalent.
To learn about the workings of the above program, like how the program works or how its dry run goes, you can refer to its separate article.
Hexadecimal to octal conversion in C++, using a user-defined function
Let's modify the above program and create it using a user-defined function, HexDecToOct(). The function takes a hexadecimal number as its argument and returns 0 if an invalid hex (hexadecimal) character is found, or returns its octal equivalent.
#include<iostream> #include<math.h> #include<string.h> using namespace std; int HexDecToOct(char []); int main() { char hexDecNum[10], octNum; cout<<"Enter the Hexadecimal Number: "; cin>>hexDecNum; octNum = HexDecToOct(hexDecNum); if(octNum==0) cout<<"\nInvalid Hex Digit!"; else cout<<"\nEquivalent Octal Value: "<<HexDecToOct(hexDecNum); cout<<endl; return 0; } int HexDecToOct(char hexDecNum[]) { int i, len=0, decNum=0, octNum=0; len = strlen(hexDecNum); len--; for(i=0; hexDecNum[i]!='\0'; i++, len--) { if(hexDecNum[i]>='0' && hexDecNum[i]<='9') decNum = decNum + (hexDecNum[i]-48)*pow(16,len); else if(hexDecNum[i]>='A' && hexDecNum[i]<='F') decNum = decNum + (hexDecNum[i]-55)*pow(16,len); else if(hexDecNum[i]>='a' && hexDecNum[i]<='f') decNum = decNum + (hexDecNum[i]-87)*pow(16,len); else return 0; } i=1; while(decNum!=0) { octNum = octNum + (decNum%8)*i; i = i*10; decNum = decNum/8; } return octNum; }
This program produces the same output as the previous program.
The same program in different languages
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