C program to Convert Octal Number to Decimal and Vice-Versa

C program to Convert Octal Number to Decimal and vice-versa.

Example-1

Example-2

C program to Convert Octal Number to Decimal Number

// C program to Convert Octal Number to Decimal
#include <stdio.h>
#include <math.h>

// It's main function of the program
int main() {
    int octal_num;
    int temp_octal_num;
    long long decimal_num;

    printf("Enter Octal Number: ");
    scanf("%d", &temp_octal_num);
    octal_num = temp_octal_num;

    // code block to convert the octal number into decimal number
    int i = 0;
    while(octal_num != 0) {
        decimal_num += (octal_num % 10) * pow(8, i);
        ++i;
        octal_num /= 10;
    }

    // final output of the program
    printf("\n%d Octal = %lld Decimal", temp_octal_num, decimal_num);
    return 0;
}

Run

Output

C program to Convert Decimal Number to Octal Number

// C program to Convert Decimal Number to Octal Number
#include <stdio.h>

// It's main function of the program
int main() {
    int decimal_num;
    int temp_decimal_num;
    int octal_num = 0;

    printf("Enter Decimal Number: ");
    scanf("%d", &temp_decimal_num);
    decimal_num = temp_decimal_num;

    // code block to convert the decimal number into octal number
    int i = 1;
    while(decimal_num != 0) {
        octal_num += (decimal_num % 8) * i;
        decimal_num /= 8;
        i *= 10;
    }

    // final output of the program
    printf("\n%d Decimal = %d Octal", temp_decimal_num, octal_num);
    return 0;
}

Run

Output