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C Programming - Declarations and Initializations

Exercise : Declarations and Initializations - Yes / No Questions
1.
Is there any difference in the following declarations?
int myfun(int arr[]);
int myfun(arr[20]);
Yes
No
Answer: Option
Explanation:
Yes, we have to specify the data type of the parameter when declaring a function.
2.
Suppose a program is divided into three files f1, f2 and f3, and a variable is defined in the file f1 but used in files f2 and f3. In such a case would we need the extern declaration for the variables in the files f2 and f3?
Yes
No
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
Global variable are available to all functions. Does there exist a mechanism by way of which it available to some and not to others.
Yes
No
Answer: Option
Explanation:
The only way this can be achieved is to define the variable locally in main() instead of defining it globally and then passing it to the functions which need it.
4.
Is it true that a global variable may have several declarations, but only one definition?
Yes
No
Answer: Option
Explanation:

Yes, In all the global variable declarations, you need to use the keyword extern.

5.
Is it true that a function may have several declarations, but only one definition?
Yes
No
Answer: Option
Explanation:

Yes, but the function declarations must be identical.

Example:

#include<stdio.h>

void Display();
void Display();
void Display();

void Display()
{
   printf("Weclome to IndiaBIX.com..!");
}

int main()
{
    Display();
    return 0;
}

//Output:
Weclome to IndiaBIX.com..!
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