Consider the following program:

int main ( ) { f1( ); f2(2); f3( ); return (0); }	int f1( ) { return (1); }	int f2 (int X) { f3( ); if (X==1) return f1 ( ); else return (X*f2(X$$-$$1)); }	int f3( ) { return (5); }

Which one of the following options represents the activation tree corresponding to the main function?

What is printed by the following ANSI C program?

 #include <stdio.h>
 int main(int argc, char *argv[]) {
    char a = 'P';
    char b = 'x';
    char c = (a & b) + '*';
    char d = (a | b) - '-';
    char e = (a ^ b) + '+';
    printf("%c %c %c\n", c, d, e);
    return 0;
 }

ASCII encoding for relevant characters is given below :

Consider the following pseudo code, where x and y are positive integers.

begin 
    q := 0 
    r := x 
   while r ≥ y do 
      begin 
      r := r - y 
      q := q + 1 
    end 
end

The post condition that needs to be satisfied after the program terminates is

Consider the following function

double f (double x) {
    if ( abs (x * x – 3) < 0. 01) return x;
    else return f (x / 2 + 1.5/x);
}

Give a value q (to 2 decimals) such that f(q) will return q:______.