Initialize decimal = 0 and a position counter i = 0.
While the octal number is not zero:
- Extract the last digit using octal % 10.
- Multiply the digit by 8^i and add it to decimal.
- Increment i by 1.
- Remove the last digit using octal /= 10.
Return decimal as the result.

Code

#include <bits/stdc++.h>
using namespace std;

class Solution {
public:
    // Function to convert octal to decimal
    int OctalToDecimal(int Octal) {
        // Initialize decimal result
        int Decimal = 0;
        // Position counter (power of 8)
        int i = 0;
        // Loop until all octal digits are processed
        while (Octal != 0) {
            // Get the last digit of octal number
            int rem = Octal % 10;
            // Add to decimal result after multiplying by 8^i
            Decimal += rem * pow(8, i);
            // Increment position
            i++;
            // Remove t