Question:
Choose the set of storage classes in C language.
Choose the set of storage classes in C language.
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The four storage class keywords in C are:
auto, register, static and extern.
Updated On: Jun 25, 2026
- Auto, register, static, extern
- Auto, static, global, extern
- Register, cache, main, extern
- Disk, tape, drum, flash drive
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The Correct Option is A
Solution and Explanation
Concept:
Storage classes in C define:
• Scope of a variable
• Lifetime of a variable
• Visibility of a variable
• Storage location The four standard storage classes in C are: \[ \text{auto} \] \[ \text{register} \] \[ \text{static} \] \[ \text{extern} \]
Step 1: Study the storage classes.
auto: Default storage class for local variables. register: Requests storage in CPU registers for faster access. static: Preserves variable value throughout program execution. extern: Allows access to globally defined variables.
Step 2: Analyze the options.
Option (A) contains all four valid storage classes. Option (B) contains "global" which is not a storage class keyword. Option (C) contains invalid entries such as cache and main. Option (D) contains storage devices rather than storage classes.
Step 3: Select the correct option.
Hence the correct set is \[ \boxed{\text{Auto, Register, Static, Extern}} \] Therefore option (A) is correct.
• Scope of a variable
• Lifetime of a variable
• Visibility of a variable
• Storage location The four standard storage classes in C are: \[ \text{auto} \] \[ \text{register} \] \[ \text{static} \] \[ \text{extern} \]
Step 1: Study the storage classes.
auto: Default storage class for local variables. register: Requests storage in CPU registers for faster access. static: Preserves variable value throughout program execution. extern: Allows access to globally defined variables.
Step 2: Analyze the options.
Option (A) contains all four valid storage classes. Option (B) contains "global" which is not a storage class keyword. Option (C) contains invalid entries such as cache and main. Option (D) contains storage devices rather than storage classes.
Step 3: Select the correct option.
Hence the correct set is \[ \boxed{\text{Auto, Register, Static, Extern}} \] Therefore option (A) is correct.
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