Convert Octal to Binary Program in C++

C++ program to Convert Octal to Binary

To convert Octal number to Binary number in C++ programming, We have to ask to the user to enter the Octal number to convert it into Binary number to display the equivalent value in Binary format on screen.
In a computer system, the binary number is expressed in the binary numeral system while the octal number is in the octal numeral system. The binary number is in base 2 while the octal number is in base 8.

Input Octal Number : 14
Euivalent Binary Number : 1100

Input Octal Number : 7
Euivalent Binary Number : 111

Input Octal Number : 10
Euivalent Binary Number : 1000

#include<iostream.h>
#include<conio.h>

void main()
{
	clrscr();
	long int i=0;
	char octnum[1000];
	cout<<"Enter any Octal Number: ";
	cin>>octnum;
	cout<<"Equivalent Binary Value: ";
	while(octnum[i])
	{
		switch(octnum[i])
		{
			case '0' : cout<<"000";
				break;
			case '1' : cout<<"001";
				break;
			case '2' : cout<<"010";
				break;
			case '3' : cout<<"011";
				break;
			case '4' : cout<<"100";
				break;
			case '5' : cout<<"101";
				break;
			case '6' : cout<<"110";
				break;
			case '7' : cout<<"111";
				break;
			default : cout<<"\nInvalid Octal Digit "<<octnum[i];
				break;
		}
		i++;
	}
	getch();
}

Enter any Octal Number: 15
Equivalent Binary Value is: 1101