Which one of the choices given below would be printed when the following…

2006

Which one of the choices given below would be printed when the following program is executed ?

 #include <stdio.h>
struct test {
               int i;
               char *c;
}st[] = {5, "become", 4, "better", 6, "jungle", 8, "ancestor", 7, "brother"};
main ()
{ 
    struct test *p = st;
    p += 1;
    ++p -> c;
    printf("%s,", p++ -> c);
    printf("%c,", *++p -> c);
    printf("%d,", p[0].i);
    printf("%s \\n", p -> c);
}

Answer: B. etter, u, 6, ungle — Key insight: trace the struct pointer p and the char* field (c); p++ and ++ applied to p->c move different things. Step 1: p = st; p += 1 makes p point to the…

  1. A.

    jungle, n, 8, nclastor

  2. B.

    etter, u, 6, ungle

  3. C.

    cetter, k, 6, jungle

  4. D.

    etter, u, 8, ncestor

Attempted by 126 students.

Show answer & explanation

Correct answer: B

Key insight: trace the struct pointer p and the char* field (c); p++ and ++ applied to p->c move different things.

  • Step 1: p = st; p += 1 makes p point to the second element: i = 4, c = "better".

  • Step 2: ++p->c increments the char* inside that struct. c moves from "better" to "etter" (skips 'b').

  • Step 3: printf("%s", p++->c) prints the current p->c ("etter"). The p++ returns the old p for the ->c access, then p increments to the next struct (i = 6, c = "jungle").

  • Step 4: printf("%c", *++p->c) operates on the current p (now the "jungle" element). ++p->c advances that c from "jungle" to "ungle", and * returns the first character 'u'.

  • Step 5: printf("%d", p[0].i) prints the current struct's integer, which is 6.

  • Step 6: printf("%s\n", p->c) prints the current c, which is now "ungle".

Program output: etter,u,6,ungle

This matches the choice that reads "etter, u, 6, ungle".

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