Function MCQs

What will be the output of the following C code?

#include <stdio.h>
void main()
{
    register int x;
    printf("%d", x);
}

What is the return-type of the function sqrt()?

Can function definition be present in header files?

What will be the output of the following C code?

#include <stdio.h>
double i;
int main()
{
   printf("%g\n",i);
   return 0;
}

Comment on the following 2 C programs.

#include <stdio.h> //Program 1
int main()
{
    int a;
    int b;
    int c;
}

#include <stdio.h> //Program 2
int main()
{
    int a;
    {
        int b;
    }
    {
        int c;
    }
}

What will be the output of the following C code?

#include <stdio.h>
void main()
{
    static int x;
    printf("x is %d", x);
}

#include are . . . . . . . . files and #include "somefile.h" . . . . . . . . files.

What will be the output of the following C code snippet?

#include (stdio.h)
void main()
{
    printf("hello");
}

What will be the output of the following C code?

#include <stdio.h>
#define foo(m, n) m ## n
void myfunc();
int main()
{
    myfunc();
}
void myfunc()
{
    printf("%d\n", foo(2, 3));
}