Problems on Variable and Strings

October 7, 2025

1. Print Name and Age

Write a program that stores your name and age in variables and prints them in a single line.
Example Output:

My name is Alice and I am 25 years old.


2. Swap Two Variables

Write a program to swap the values of two variables a and b.
Example:

Input: a = 10, b = 20
Output: a = 20, b = 10


3. String Concatenation

Given two strings first and last, join them with a space between.
Example:

Input: first = "Data", last = "Science"
Output: "Data Science"


4. Find String Length

Write a program that takes a string s and prints its length.
Example:

Input: "Python"
Output: 6


5. Extract Substring

Given a string word = "datascience", print only "data".
Expected Output:

data


6. Convert to Uppercase

Take a string input and print it in uppercase.
Example:

Input: "hello world"
Output: "HELLO WORLD"


7. Count Occurrences of a Character

Write a program that counts how many times 'a' appears in a string.
Example:

Input: "banana"
Output: 3


8. Replace a Word

Given a sentence, replace "apple" with "orange".
Example:

Input: "I like apple"
Output: "I like orange"


9. Check Substring

Check if the word "code" exists in a given string.
Example:

Input: "I love to code in Python"
Output: True


10. Reverse a String

Write a program that reverses a string.
Example:

Input: "python"
Output: "nohtyp"


11. Remove Whitespace

Remove all leading and trailing spaces from a string.
Example:

Input: "   Hello World   "
Output: "Hello World"


12. Format String

Given variables name = "Alice" and score = 95, print:

Alice scored 95 marks.


13. Repeat String

Write a program to print "ha" 5 times.
Output:

hahahahaha


14. First and Last Character

Write a program to print the first and last characters of a string.
Example:

Input: "Python"
Output: P n


15. Capitalize First Letter

Write a program that converts "hello world" into "Hello world".
Expected Output:

Hello world

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