﻿ C# - Convert Octal number to Decimal number

# C#: Convert Octal number to Decimal number

## C# Sharp For Loop: Exercise-51 with Solution

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

Visual Presentation:

Sample Solution:

C# Sharp Code:

using System;  // Importing necessary namespace

public class Exercise51  // Declaration of the Exercise51 class
{
public static void Main()  // Main method, entry point of the program
{
// Declaration of variables
int n1, n5, p = 1, k, ch = 1;
int dec = 0, i = 1, j, d;

// Displaying information about converting octal to decimal
Console.Write("\n\n");
Console.Write("Convert Octal number to Decimal number:\n");
Console.Write("------------------------------------------");
Console.Write("\n\n");

// Prompting the user to enter an octal number
Console.Write("Input an octal number (using digit 0 - 7) :");
n5 = n1;  // Storing the original number for display

// Loop to check if the entered number is a valid octal number
for (; n1 > 0; n1 = n1 / 10)
{
k = n1 % 10;
if (k >= 8)
{
ch = 0;  // If a digit is more than 7, it's not a valid octal number
}
}

// Switch statement to handle validation and conversion
switch (ch)
{
case 0:
Console.Write("\nThe number is not an octal number. \n\n");
break;
case 1:
n1 = n5;  // Restoring the original octal number
// Loop to convert octal to decimal
for (j = n1; j > 0; j = j / 10)
{
d = j % 10;
if (i == 1)
p = p * 1;
else
p = p * 8;

dec = dec + (d * p);
i++;
}
// Displaying the converted decimal number
Console.Write("\nThe Octal Number : {0}\nThe equivalent Decimal  Number : {1} \n\n", n5, dec);
break;
}
}
}

Sample Output:

Convert Octal number to Decimal number:
------------------------------------------
Input an octal number (using digit 0 - 7) :5
The Octal Number : 5
The equivalent Decimal  Number : 5

Flowchart:

C# Sharp Code Editor: