#include <iostream.h>
#include <conio.h>
void octobin(int);

void main()
{
clrscr();
int a;
cout << “Enter a 2-digit octal number : “;
cin>>a;
octobin(a);
getch();
}
void octobin(int oct)
{
long bnum=0;
int A[6];
//Each octal digit is converted into 3 bits, 2 octal digits = 6 bits.
int a1,a2,quo,rem;
a2=oct/10;
a1=oct-a2*10;
for(int x=0;x<6;x++)
{
A[x]=0;
}
//Storing the remainders of the one’s octal digit in the array.
for (x=0;x<3;x++)
{
quo=a1/2;
rem=a1%2;
A[x]=rem;
a1=quo;
}
//Storing the remainders of the ten’s octal digit in the array.
for(x=3;x<6;x++)
{
quo=a2/2;
rem=a2%2;
A[x]=rem;
a2=quo;
}
//Obtaining the binary number from the remainders.
for(x=x-1;x>=0;x–)
{
bnum*=10;
bnum+=A[x];
}
cout << “The binary number for the octal number ” << oct << ” is ” << bnum << “.” << endl;
}

This program takes in a two-digit octal number a as a screen input from the user.
It then converts the octal number into a binary number and outputs it using the ‘cout’ command.

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