- 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 Octal
In this article, you will learn and get code on decimal to octal conversion in C++. The program is created with and without using the modulo operator. Also, with and without the use of a user-defined function.
But before going through the program, if you are not aware of the steps and logic used behind the conversion, refer to Decimal to Octal.
Decimal to Octal in C++
To convert a decimal number to an octal number in C++ programming, you have to ask the user to enter the decimal number first. and then convert it into its equivalent octal value as shown in the program given below:
#include<iostream> using namespace std; int main() { int decimalNum, octalNum[50], i=0; cout<<"Enter any Decimal number: "; cin>>decimalNum; 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 built and runs under the Code::Blocks IDE. Here is its sample run:
Now, enter any decimal number, such as 358, and press the ENTER key to see its equivalent octal value, as shown in the screenshot below:
The following is a dry run of the above program with a decimal number input, say 358:
- Initial value, i=0
- When the user enters a decimal number, say 358, it gets stored in decimalNum.
- Now the condition of the while loop gets evaluated. That is, the condition decimalNum!=0 or 358!=0 evaluates to be true, therefore program flow goes inside the loop.
- There, decimalNum%8 or 358%8 or 6 gets initialized to octalNum[i] or octalNum[0]. Because, we divided the number 358 by 8, we got the remainder of 6.
- The value of i gets incremented. So i=1
- And decimalNum/8, 358/8, or 44 is set to decimalNum.
- Now the program flow goes back and evaluates the condition of the while loop again with a new value of decimalNum.
- Continue evaluating the condition of the while loop until it evaluates to false.
- If we continue the process, we will obtain the following values:
- octalNum[0]=6
- octalNum[1]=4
- octalNum[2]=5
- Before the value of decimalNum becomes equal to 0, the value of i gets incremented. Furthermore, if the value of decimalNum is 0, the while loop condition evaluates to false. As a result, the while loop's evaluation is completed.
- And we must print the value of octalNum[] from the last to the 0th index.
- So, we used the for loop to print the value from i-1 to the 0th index of octalNum[].
- In this way, 546 gets printed as the octal equivalent of the given decimal number 358.
Decimal to octal conversion in C++ without using the modulo operator
This program does not use the modulo operator (%) while converting a decimal number to octal.
#include<iostream> using namespace std; int main() { int decimalNum, octalNum[50], i=0, temp, chk, rem; cout<<"Enter any Decimal number: "; cin>>decimalNum; while(decimalNum!=0) { temp = decimalNum/8; chk = temp*8; rem = decimalNum - chk; octalNum[i] = rem; i++; decimalNum = temp; } cout<<"\nEquivalent Octal Value = "; for(i=(i-1); i>=0; i--) cout<<octalNum[i]; cout<<endl; return 0; }
It will produce the same output as the previous program.
Decimal to octal conversion in C++ using a user-defined function
This is the last program that uses the user-defined function DecimalToOctal(). It takes a decimal number as its argument and converts it into its equivalent octal value.
#include<iostream> using namespace std; void DecimalToOctal(int); int octalNum[50]; static int i; int main() { int decimalNum; cout<<"Enter any Decimal number: "; cin>>decimalNum; DecimalToOctal(decimalNum); cout<<"\nEquivalent Octal Value = "; for(i=(i-1); i>=0; i--) cout<<octalNum[i]; cout<<endl; return 0; } void DecimalToOctal(int decimalNum) { while(decimalNum != 0) { octalNum[i] = decimalNum%8; i++; decimalNum = decimalNum/8; } }
This program has the same output as the first program in this article.
Note: A static int type variable initializes its initial value as 0, automatically.
The same program in different languages
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