Consider the following C program:

#include < stdio.h >
  int counter = 0;
  int calc (int a, int b) {
  int c;
  counter++;
  if (b==3) return (a*a*a);
  else {
    c = calc(a, b/3);
    return (c*c*c);
 }
}
int main (){
  calc(4, 81);
  printf ("%d", counter);
}

The output of this program is _____.

Consider the following C program segment.

#include < stdio.h >
int main()
{
    char s1[7] = "1234", *p;
    p = s1 + 2;
   *p = ‘0’;
    printf("%s", s1);
}

What will be printed by the program?

Consider the following function written in the C programming language.

void foo(char *a){
 if ( *a && *a != ' '){
     foo(a+1);
     putchar(*a);
   }
}

The output of the above function on input “ABCD EFGH” is

What will be the output of the following C program segment?

Char inchar = 'A';
Switch ( inchar ) {
case 'A' : printf ("Choice A\ n") ;
case 'B' :
case 'C' : printf (“Choice B”) ;
case 'D' :
case 'E' :
default : printf ( " No Choice" ) ; }