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OUTPUT (after running):
Enter a number: 153
153 is an Armstrong number
Run2:
Enter a number: 15
15 is not an Armstrong number
Q9.
Write a C program to check whether a given number is binary.
[Hint:
         void main( )
                    {
                     int r=0,c=0, num, b;
               printf(“Enter a number:”);
              scanf(“%d”, &num);
              b = num;
              while(num > 0)
               {
                       if((num % 10 ==0) || (num%10==1))
                       c++;
                       r++;
                       num=num/10;
               }
               if(c= =r)
                 printf( “b is a binary number.”;
               else
                 cout << b <<”is not a binary number.”);

---

               }
            }