Which type cannot be the controlling expression of a switch statement?

What does a class in C++ contain?

Can the getch() function be used to echo the input?

What is the output of the following C code?

int main()

{

       printf("%c\n","abcdefgh"[4]);

}

What is the output of the following C code?

int main()

{

  int var = -(-3);

  printf("%d", var);

}

#include int main() { int b = 0; int a = (~b == 0); printf("%d", a); return 0; }

What happens if the following line is executed in C and C++?

const int a;

What will be the output of the following C code?

int main()

{

        register int a = 10;

       {

              register int a = 15;

              printf("%d ", a);

       }

       printf("%d ", a);

       return 20;

}

What is the output of the following program?

int main()

{

  char arr[]="hello\0\0\0\0\0";

  char arr1[]="hello\n\n\n\n\n";

  printf("%d %d\n",sizeof(arr),strlen(arr));

  printf("%d %d\n",sizeof(arr1),strlen(arr1));

}

Which of the following statements is correct?

1. Pointer to a reference and reference to a pointer both are valid.
2. When we use reference, we are actually referring to a referent.