Python program to count upper and lower case characters without using inbuilt functions

In this article, we will learn about the solution and approach to solve the given problem statement.

Problem statement

Given a string input, we need to find the number of uppercase & lowercase characters in the given strings.

Here we will we checking ASCII value of each character by the help of built-in ord() function.

Here we have assigned two counters to 0 and we are traversing the input string and checking their ASCII values and incrementing their counter respectively.

Now let’s see the implementation below −

Example

def upperlower(string):
   upper = 0
   lower = 0
   for i in range(len(string)):
      # For lowercase
      if (ord(string[i]) >= 97 and
         ord(string[i]) <= 122):
         lower += 1
      # For uppercase
      elif (ord(string[i]) >= 65 and
         ord(string[i]) <= 90):
         upper += 1
   print('Lower case characters = %s' %lower,
      'Upper case characters = %s' %upper)
# Driver Code
string = 'Tutorialspoint'
upperlower(string)

Output

Lower case characters = 13 Upper case characters = 1

All variables and functions are declared in global scope as shown in the figure below.

Conclusion

In this article, we learned about the approach to count upper and lower case characters without using inbuilt functions.