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PONVEL M
PONVEL M

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Printing Characters and Their ASCII Values (Java, Python, JavaScript)

Introduction

In programming, every character has a numeric value called an ASCII value.

ASCII stands for American Standard Code for Information Interchange

It is used to represent characters like letters, numbers, and symbols in computers.

What is ASCII Value?

Each character is mapped to a number.

Examples:

  • 'A' → 65
  • 'a' → 97
  • '0' → 48
  • '@' → 64

Problem Statement

Given a string:

ponvelm2@gmail.com
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Print each character along with its ASCII value.

Logic Explanation

We need to:

  1. Traverse the string (loop)
  2. Take each character
  3. Convert it to ASCII value
  4. Print the result

Java Solution 

public class Main {
    public static void main(String[] args) {
        String str = "ponvelm2@gmail.com";

        for (int i = 0; i < str.length(); i++) {
            char ch = str.charAt(i);
            int ascii = (int) ch;

            System.out.println(ch + " -> " + ascii);
        }
    }
}
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Python Solution 

str = "ponvelm2@gmail.com"

for ch in str:
    print(ch, "->", ord(ch))
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JavaScript Solution 

let str = "ponvelm2@gmail.com";

for (let i = 0; i < str.length; i++) {
  let ch = str[i];
  console.log(ch + " -> " + ch.charCodeAt(0));
}
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Sample Output 

p -> 112
o -> 111
n -> 110
v -> 118
e -> 101
l -> 108
m -> 109
2 -> 50
@ -> 64
g -> 103
m -> 109
a -> 97
i -> 105
l -> 108
. -> 46
c -> 99
o -> 111
m -> 109
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Real-World Use Cases

This concept is useful in:

  • Data encoding
  • Encryption basics
  • Input validation
  • String manipulation problems
  • Competitive programming

Common Mistakes

Forgetting to loop through the string
Not converting character properly
Using wrong method (ord, charCodeAt, etc.)

Interview Tips

This is a basic but important question.
Interviewers may extend it to:

  • Count vowels and consonants
  • Remove special characters
  • Reverse a string
  • Find duplicate characters

Conclusion

Understanding ASCII values helps in building strong fundamentals in programming.

By practicing simple problems like this, you can improve your logic and problem-solving skills.

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