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Number System क्या है — Binary, Octal, Decimal, Hex हिंदी में

Number system की पूरी जानकारी हिंदी में। Binary, Octal, Decimal, Hexadecimal क्या हैं, आपस में convert कैसे करें — examples और tables के साथ।

Number System क्या होता है?

Computer science पढ़ रहे हो तो सबसे पहला chapter जो आता है वो है Number System। ये BCA, BTech, और competitive exams का most important topic है। आज हम इसे बिल्कुल आसान भाषा में समझेंगे।

🔧 अभी convert करें: Number System Converter — binary, octal, decimal, hex एक click में convert करें step-by-step working के साथ।

Number System एक mathematical system है जो numbers को represent करने का तरीका बताता है। हर number system एक base (या radix) पर काम करता है।

चार Main Number Systems

Number SystemBaseDigits UsedUse Case
Binary20, 1Computers, digital circuits
Octal80-7Unix permissions, old systems
Decimal100-9Daily life, counting
Hexadecimal160-9, A-FMemory addresses, colors

Decimal 0-15 in All Four Bases

DecimalBinaryOctalHexadecimal
0000000
1000111
2001022
3001133
4010044
5010155
6011066
7011177
81000108
91001119
10101012A
11101113B
12110014C
13110115D
14111016E
15111117F

Conversion Methods (Short Examples)

Decimal → Binary (Divide by 2)

25 को binary में convert करें:

25 ÷ 2 = 12 remainder 1 12 ÷ 2 = 6 remainder 0 6 ÷ 2 = 3 remainder 0 3 ÷ 2 = 1 remainder 1 1 ÷ 2 = 0 remainder 1

नीचे से ऊपर पढ़ें: 11001

Binary → Decimal (Positional value)

1101 को decimal में: 1×2³ + 1×2² + 0×2¹ + 1×2⁰ = 8+4+0+1 = 13

Binary → Octal (Group of 3)

110111 को octal में: 110 | 111 = 6 | 7 = 67

Binary → Hex (Group of 4)

11011110 को hex में: 1101 | 1110 = D | E = DE

कहाँ Use होता है?

  • Binary: Computers, RAM, processor — सब binary में काम करता है
  • Octal: Linux/Unix file permissions (chmod 755)
  • Decimal: Daily math, counting, money
  • Hexadecimal: CSS colors (#FF5733), memory addresses, MAC addresses

BCA/BTech Exams में कैसे आता है?

  • “Convert 156 decimal to binary” (2-3 marks)
  • “Convert 1011101 binary to octal and hex” (3-5 marks)
  • “Explain number system with base and examples” (5-10 marks)
  • “Compare all four number systems” (table-based question)

FAQ — अक्सर पूछे जाने वाले सवाल

Q: Number system में base ka matlab kya hota hai? A: Base बताता है कि उस system में कितने unique digits available हैं। Binary का base 2 (दो digits: 0,1), Decimal का base 10 (दस digits: 0-9)।

Q: Computer binary kyun use karta hai? A: क्योंकि electronic circuits sirf 2 states (ON/OFF) easily handle कर सकते हैं। 10 different voltage levels maintain करना practically mushkil है।

Q: Hexadecimal mein A-F kya represent karte hain? A: A=10, B=11, C=12, D=13, E=14, F=15 (decimal values)। ये extra digits hain kyunki base-16 mein 16 symbols chahiye।

Q: Octal system aaj bhi use hota hai? A: Haan — Linux/Unix mein file permissions octal mein likhi jaati hain (755, 644, etc.)। Lekin modern programming mein hex zyada popular hai।

Q: Exam mein sabse zyada kaunsa conversion aata hai? A: Decimal ↔ Binary sabse common hai, followed by Binary ↔ Hex। Octal conversions bhi regularly aate hain BCA/BTech papers mein।

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Last Updated: June 2026

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