What is the scope and linkage of a top-level global variable declared as 'static int var = 31;' in a C source file?
The 'static' specifier at file scope restricts visibility to internal linkage, making the variable accessible only within the declaring translation unit.
What is the output of the following C code?
#include <stdio.h>
int x = 32;
int main(void) {
int x = 42;
{
int x = 52;
printf("%d ", x);
}
printf("%d", x);
return 0;
}Inner block scope declarations shadow outer scope declarations of the same identifier name.
Consider a function returning a value: 'int calc(int a) { static int s = 33; s += a; return s; }'. What is returned by calling calc(5) twice consecutively?
Static local variable 's' retains its updated value across consecutive function calls.
What does the declaration 'extern int arr[34];' inside a function indicate?
'extern' provides a reference to a global symbol defined elsewhere; it does not allocate memory.
What is the effect of declaring a function parameter as 'register int count' in C?
The 'register' keyword can be applied to function parameters as a compiler hint for register allocation.