### Python program to convert Octal to Decimal, Binary, Hexadecimal

`DESCRIPTION: The below code converts Octal to Decimal, Binary, Hexadecimal.`
`The user has to enter a choice, and then the octal value for converting it into its respective `
`choice.`
`Enter 1 for Octal to Decimal conversion`
`Enter 2 for Octal to Binary conversion`
`Enter 3 for Octal to Hexadecimal conversion`

```#The class is converting octal numbers
class Octal():
#Constructor takes the Choice
def __init__(self, choice):
self.choice = choice

def octal_conversion(self):
#If entered choice is 1, 2, or 3
if(self.choice >=1 and self.choice <= 3):
#Enter octal number
octal = input("Enter number in octal format: ")

#Octal to Decimal
if self.choice == 1:
decimal = str(int(octal,8))
print(octal, "in Decimal is ", decimal)

#Octal to Binary
elif self.choice == 2:
decimal = str(int(octal, 8))
decm = int(decimal)
print(octal, "in Binary is ", bin(decm))

elif self.choice == 3:
decimal = str(int(octal, 8))
decm = int(decimal)
print(octal, "in HexaDecimal is ", hex(decm))
#If user wants to exit
elif self.choice == 4:
exit()
#User enters an invalid choice
else:
print("Invalid Entry!!")

def main():
#Following choices can be entered
#for converting Octal to Decimal, Binary, Hexadecimal
print("Type")
print("1 for Octal to Decimal")
print("2 for Octal to Binary")
print("4 for exit")
#Enter a valid choice
choice = int(input("Enter your Choice: "))
#Object created for the class Octal
obj_Octal = Octal(choice)
obj_Octal.octal_conversion()

if __name__ == "__main__":
main()

OUTPUT:
Test case 1:
Type
1 for Octal to Decimal
2 for Octal to Binary
4 for exit
Enter number in octal format: 2567
2567 in Decimal is  1399
Test case 2:
Type
1 for Octal to Decimal
2 for Octal to Binary
4 for exit
Enter number in octal format: 2567
2567 in Binary is  0b10101110111
Test case 3:
Type
1 for Octal to Decimal
2 for Octal to Binary
4 for exit
Enter number in octal format: 2567
Test case 4:
Type
1 for Octal to Decimal
2 for Octal to Binary
4 for exit
Invalid Entry!!
```

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