C Exercises: Convert decimal number to octal without using an array

Last update on March 18 2025 13:34:30 (UTC/GMT +8 hours)

50. Decimal to Octal Conversion (Without Array)

Write a program in C to convert a decimal number into octal without using an array.

This C program converts a decimal number into octal without using an array. It initializes variables for the decimal number and a multiplier for octal digits. Then, it iterates through the decimal number, calculating each octal digit and updating the result accordingly. Finally, it prints the converted octal number.

Visual Presentation:

Convert decimal number to octal without using an array

Sample Solution:

C Code:

#include <stdio.h> // Include the standard input/output header file.

void main() {
    int n, i, j, ocno = 0, dn; // Declare variables to store input and results.

    printf("\n\nConvert Decimal to Octal:\n "); // Print a message.
    printf("-------------------------\n"); // Print a separator.

    printf("Enter a number to convert : "); // Prompt the user for input.
    scanf("%d", &n); // Read the input decimal number.

    dn = n; // Store the original value of the decimal number.
    i = 1; // Initialize the multiplier for the octal digits.

    for (j = n; j > 0; j = j / 8) {
        ocno = ocno + (j % 8) * i; // Calculate the octal digit and add it to the result.
        i = i * 10; // Update the multiplier for the next octal digit.
        n = n / 8; // Update the quotient for the next iteration.
    }

    printf("\nThe Octal of %d is %d.\n\n", dn, ocno); // Print the result.
}

Output:

Convert Decimal to Octal:                                                                                     
 -------------------------                                                                                    
Enter a number to convert : 79                                                                                
                                                                                                              
The Octal of 79 is 117.

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to convert a decimal number to octal without using arrays by applying recursion.
Write a C program to convert a decimal number to octal without arrays and count the number of octal digits.
Write a C program to convert a decimal number to octal without arrays and display the output in a formatted string.
Write a C program to convert a decimal number to octal without arrays and verify the conversion by converting it back.

C Programming Code Editor:

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