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GO Classes DPP | GATE CS | C Programming | Array Expression

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7 7 votes

What is the output of the following code?

#include <stdio.h>

int main() {
    int a[] = {2, 4, 6, 8, 10};

    printf("%d %d %d", *a, *(a + 3), 3[a]);

    return 0;
}
  1. $\texttt{2 6 8}$
     
  2. $\texttt{2 8 8}$
     
  3. $\texttt{4 8 10}$
     
  4. $\texttt{Compilation error}$

2 Answers

0 0 votes

In C, the array name $\texttt{a}$ represents the base address of the array.

So,

$\texttt{a}$ means $\texttt{(a + 0)}$

Therefore,

$\texttt{*a = a[0] = 2}$

Now,

$\texttt{*(a + 3)}$ means value at index $\texttt{3}$.

So,

$\texttt{*(a + 3) = a[3] = 8}$

Also,

$\texttt{3[a]}$ looks unusual, but it is valid in C.

Because:

$\texttt{3[a] = *(3 + a)}$

And this is the same as:

$\texttt{a[3]}$

So,

$\texttt{3[a] = 8}$
 

$\therefore$ Output : $\texttt{2 8 8}$
 

Answer: B

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