In a string of Alphabets and numbers that a user will input how can we remove the numbers and display output of alphabet only?

Question

C++ solution needed

Answer 1

big alphabet characters have integer values from 65 to 90.

small alphabet characters have integer values from 97 to 122.

When you want to check, whether a character is an alphabet, you need to handle the character as an integer and check, whether the integer is in either of these previous ranges:
c >= 65 && c <= 90 || c >= 97 && c <= 122

You can iterate through a string with a char variable and only print the characters, for which the previous condition is true.
(string represents the user input)