What is printed by the following C program?

int f(int x, int *py, int **ppz) {   int y, z;   **ppz += 1;     z  = **ppz;   *py += 2;    y = *py;    x += 3;    return x + y + z; }   void main() {    int c, *b, **a;    c = 4;    b = &c;    a = &b;     printf( "%d", f(c,b,a));    getchar(); }

(A) 18
(B) 19
(C) 21
(D) 22

Answer (B)

/* Explanation for the answer */     /*below line changes value of c to 5. Note that x remains unaffected     by this change as x is a copy of c and address of x is different from c*/   **ppz += 1     /* z is changed to 5*/   z  = **ppz;     /* changes c to 7, x is not changed */   *py += 2;      /* y is changed to 7*/   y = *py;       /* x is incremented by 3 */    x += 3;       /* return 7 + 7 + 5*/   return x + y + z;