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Which of the following type declarations is best suited to store a large positive integer value that requires exactly 64 bits in C?

hard📝 Application Q8 of 15
C - Variables and Data Types
Which of the following type declarations is best suited to store a large positive integer value that requires exactly 64 bits in C?
Asigned long int
Bunsigned long long int
Clong int
Dunsigned int
Step-by-Step Solution
Solution:

  1. Step 1: Understand size requirements

    64 bits means 8 bytes, so the type must be 64-bit wide.

  2. Step 2: Consider sign requirements

    Since only positive values are needed, 'unsigned' is preferred.

  3. Step 3: Match type modifiers

    'unsigned long long int' guarantees at least 64 bits and stores only non-negative values.

  4. Final Answer:

    unsigned long long int -> Option B

  5. Quick Check:

    Use 'unsigned long long int' for 64-bit positive integers [OK]
Quick Trick: Use 'unsigned long long int' for 64-bit positive numbers [OK]
Common Mistakes:
  • Using 'long int' which may be 32-bit on some systems
  • Choosing signed types when only positive needed
  • Assuming 'unsigned int' is 64-bit

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