The default storage class of a variable in C and C++ is **auto**.

### Explanation
1. **Auto**: This storage class is the default for variables defined within a function or a block. Variables declared with auto are stored in the stack and have automatic duration, meaning they are created and destroyed when the program execution enters and exits the block.

2. **Extern**: This storage class is used for declaring a variable that is defined in another file or at a different scope. It does not provide a default storage class for variables.

3. **Static**: The static storage class is used to keep variables alive even after their block ends. However, it is not the default for local variables.

4. **Register**: This storage class suggests that the variable be stored in a register instead of RAM, but it is not a default storage class.

### Final Answer
The default storage class of a variable is **auto**.

Question

The default storage class of a variable in C and C++ is **auto**.

### Explanation
1. **Auto**: This storage class is the default for variables defined within a function or a block. Variables declared with auto are stored in the stack and have automatic duration, meaning they are created and destroyed when the program execution enters and exits the block.
  
2. **Extern**: This storage class is used for declaring a variable that is defined in another file or at a different scope. It does not provide a default storage class for variables.

3. **Static**: The static storage class is used to keep variables alive even after their block ends. However, it is not the default for local variables.

4. **Register**: This storage class suggests that the variable be stored in a register instead of RAM, but it is not a default storage class.

### Final Answer
The default storage class of a variable is **auto**.

Knowee AI · Accepted Answer

The default storage class of a variable in C and C++ is **auto**.

### Explanation
1. **Auto**: This storage class is the default for variables defined within a function or a block. Variables declared with auto are stored in the stack and have automatic duration, meaning they are created and destroyed when the program execution enters and exits the block.
  
2. **Extern**: This storage class is used for declaring a variable that is defined in another file or at a different scope. It does not provide a default storage class for variables.

3. **Static**: The static storage class is used to keep variables alive even after their block ends. However, it is not the default for local variables.

4. **Register**: This storage class suggests that the variable be stored in a register instead of RAM, but it is not a default storage class.

### Final Answer
The default storage class of a variable is **auto**.

orrect answerDefault storage class of a variable is ________Optionsautoexternstaticregister

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