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__________ tells a compiler that the data would be defined somewhere and it would be connected to the linker.
- a)variable
- b)yvals
- c)errno
- d)extern
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
__________ tells a compiler that the data would be defined somew...
- The extern keyword in C/C++ tells the compiler that the data (variables or functions) would be defined somewhere else in the program, and it should be connected to the linker during the linking phase. This is typically used when you want to use a variable or function that is defined in a different source file or a library.
- By using extern, you are informing the compiler that the actual definition of the variable or function is located elsewhere, and it should not be treated as a new definition, but rather a reference to the existing one. The linking phase will then resolve these references and connect them with the appropriate definitions from other source files or libraries.
Most Upvoted Answer
__________ tells a compiler that the data would be defined somew...
- The extern keyword in C/C++ tells the compiler that the data (variables or functions) would be defined somewhere else in the program, and it should be connected to the linker during the linking phase. This is typically used when you want to use a variable or function that is defined in a different source file or a library.
- By using extern, you are informing the compiler that the actual definition of the variable or function is located elsewhere, and it should not be treated as a new definition, but rather a reference to the existing one. The linking phase will then resolve these references and connect them with the appropriate definitions from other source files or libraries.
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__________ tells a compiler that the data would be defined somew...
Explanation:
extern:
- The keyword "extern" in C tells the compiler that the data is defined somewhere else in the program or in a separate file, and it will be connected to the linker during the linking phase.
- It is used when you want to use a variable or function that is defined in another file or scope.
Usage:
- When you declare a variable or function as extern, you are telling the compiler not to allocate memory for it because it will be defined elsewhere.
- This allows you to share variables or functions across multiple files without having to redefine them.
Linker:
- The linker is a program that combines multiple object files generated by the compiler into a single executable file.
- It resolves references to external symbols like variables or functions declared as extern.
Example:
- Suppose you have a variable "count" defined in a file called "example.c" and you want to use it in another file "main.c".
- In "main.c", you would declare the variable as extern: extern int count;
- This tells the compiler that the variable "count" is defined elsewhere and will be connected by the linker.
Conclusion:
- Using the "extern" keyword allows for modular programming by enabling sharing of variables and functions across different files or scopes within a program.
extern:
- The keyword "extern" in C tells the compiler that the data is defined somewhere else in the program or in a separate file, and it will be connected to the linker during the linking phase.
- It is used when you want to use a variable or function that is defined in another file or scope.
Usage:
- When you declare a variable or function as extern, you are telling the compiler not to allocate memory for it because it will be defined elsewhere.
- This allows you to share variables or functions across multiple files without having to redefine them.
Linker:
- The linker is a program that combines multiple object files generated by the compiler into a single executable file.
- It resolves references to external symbols like variables or functions declared as extern.
Example:
- Suppose you have a variable "count" defined in a file called "example.c" and you want to use it in another file "main.c".
- In "main.c", you would declare the variable as extern: extern int count;
- This tells the compiler that the variable "count" is defined elsewhere and will be connected by the linker.
Conclusion:
- Using the "extern" keyword allows for modular programming by enabling sharing of variables and functions across different files or scopes within a program.
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