DECIMAL NUMBERS

Decimal – Simple Definition A decimal number is a number written using the base-10 system . Decimal Numbers – Basic Idea To break a decimal number (example: 2345) into digits: no % 10 → gets the last digit no // 10 → removes the last digit This is the main logic used in all programs SUM OF DIGITS What does it do? It adds all the digits in a number Example: 2345 → 2 + 3 + 4 + 5 = 14 Loop Method We use a while loop to add digits one by one SUM OF DIGITS IN LOOP : no = 2345 sum = 0 while no > 0 : sum = sum + no % 10 no = no // 10 print ( sum ) OUTPUT : 14 Recursion Method The function calls itself again and again to repeat the process SUM OF DIGITS IN RECURSION : def sum1 ( no , sum ): if no > 0 : sum = sum + no % 10 no = no // 10 return sum1 ( no , sum ) return sum print ( sum1 ( 1234 , 0 )) OUTPUT : 10 COUNT OF DIGIT What does it do? It counts how many digits are in a number Example: 2345 → 4 digits Loop Method In each step, we do count += 1 COUNT OF DIGITS IN LOOP : no = 2345 count = 0