Here is a basic way to get the octal value of a decimal number. In this program, a for loop is used which will get the remainder, decrease the number by dividing it by 8 and populate the array. At the end, we will simply print the array in reverse order.
#include<iostream.h>
#include<conio.h>
void main()
{
int num,rem,div,i=0,a[100];
cout<<"Enter the number : ";
cin>>num; //getting the number
for (div=num/8;div>0;)
{
if (i==0)
rem=num%8;
else
{
rem=div%8; //dividing the number by 8 to get remainder and getting new number
div=div/8;
}
a[i]=rem; //populating the array with remainder
i++;
}
cout<<endl<<"The Octal Value of given number is : ";
for (int k=i-1;k>=0;k--)
cout<<a[k]; //printing the array in reverse order
getch();
}
