What is ASCII Code?

ASCII means American Standard Code for Information Interchange.

It is a system that changes letters, numbers, and symbols into numbers, so computers can understand them.

Examples:

• A → 65
• a → 97
• 0 → 48
• @ → 64

Computers cannot understand text directly
They understand only numbers

So, ASCII helps convert characters into numbers.

Why was ASCII introduced?

Before ASCII, each computer had its own way of storing characters

This created problems when sharing data between computers.

Problems before ASCII:

• Different systems used different codes
• Same character had different meanings
• Data sharing was difficult

Solution: ASCII

ASCII was introduced to:

1. Standardize characters
   • Same number for same character everywhere
2. Make data sharing easy
   • Files can be opened in different systems
3. Improve communication
   • Helpful in early internet and networking

ASCII range = 0 to 127

• 0–31 → Control characters
• 32–126 → Printable characters
• 127 → Delete

Printable Characters (32–126)

These are visible characters:

• 32 → Space
• 48–57 → Numbers (0–9)
• 65–90 → Uppercase letters (A–Z)
• 97–122 → Lowercase letters (a–z)
• Others → Symbols (!, @, #, etc.)

ASCII PROGRAM :

name="[e-mail]"
index=0
while (index < name.length) {
    console.log(name[index]+ " = " + name.charCodeAt(index));
    index+=1
}

OUTPUT :