C Program to Convert Decimal to Octal

July 10, 2026

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✅ C Program to Convert Decimal Number to Octal

#include <stdio.h>

int main() {
    int num, octal[32], i = 0;

    printf("Enter a decimal number: ");
    scanf("%d", &num);

    if (num == 0) {
        printf("Octal: 0\n");
        return 0;
    }

    while (num > 0) {
        octal[i] = num % 8;   // store remainder (0–7)
        num = num / 8;        // reduce number
        i++;
    }

    printf("Octal: ");
    for (int j = i - 1; j >= 0; j--) {  // print in reverse
        printf("%d", octal[j]);
    }
    printf("\n");

    return 0;
}

📘 Explanation:

This program converts a decimal number into its octal representation:

We repeatedly divide the number by 8 and store the remainders (0–7).
These remainders are stored in an array.
Finally, we print the array in reverse order to get the correct octal format.
If the number is 0, the output is directly 0.

🧾 Sample Output:

Enter a decimal number: 10
Octal: 12

Enter a decimal number: 25
Octal: 31

🔑 Keywords:

C program decimal to octal, decimal to octal conversion, division by 8 method in C, octal number C program, beginner C examples

📌 Hashtags:

#CProgramming #OctalConversion #DecimalToOctal #CExamples #CodingForBeginners

🔍 Search Description:

This C program converts a decimal number into octal using division by 8 method. It stores remainders in an array and prints them in reverse order with example outputs.

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