Table of Contents
In this example, you will learn to count the number of digits present in a number.
To understand this example, you should have the knowledge of the following Python programming topics:
1. Example 1: Count Number of Digits in an Integer using while loop
num = 3452 count = 0 while num != 0: num //= 10 count += 1 print("Number of digits: " + str(count))
Output
Number of digits: 4
In this program, the while loop is iterated until the test expression num != 0
is evaluated to 0 (false).
- After the first iteration,
num
will be divided by 10 and its value will be 345. Then, thecount
is incremented to 1. - After the second iteration, the value of
num
will be 34 and thecount
is incremented to 2. - After the third iteration, the value of
num
will be 3 and thecount
is incremented to 3. - After the fourth iteration, the value of
num
will be 0 and thecount
is incremented to 4. - Then the test expression is evaluated to false and the loop terminates.
2. Example 2: Using inbuilt methods
num = 123456 print(len(str(num)))
Output
6
In the above example, we first convert the integer value into string by using str()
. Then, we find the length of the string using len()
.
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