GATE CS 2022 Set 1 — Question 43
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Programming & Data Structures → C Programming → Arrays & Strings in C
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Question
What is printed by the following ANSI C program?
#include<stdio.h>
int main(int argc, char *argv[])
{
int a[3][3][3] =
{{1, 2, 3, 4, 5, 6, 7, 8, 9},
{10, 11, 12, 13, 14, 15, 16, 17, 18},
{19, 20, 21, 22, 23, 24, 25, 26, 27}};
int i = 0, j = 0, k = 0;
for( i = 0; i < 3; i++ ){
for(k = 0; k < 3; k++ )
printf("%d ", a[i][j][k]);
printf("\n");
}
return 0;
}
Correct answer
(A) 1 2 3 10 11 12 19 20 21
Solution
The array
1 2 3
10 11 12
19 20 21
a is a 3D array of dimensions . It is initialized with three blocks of elements.a[0]corresponds to the first block:{1, 2, 3, 4, 5, 6, 7, 8, 9}. In row-major order,a[0][0]is{1, 2, 3}.a[1]corresponds to the second block:{10, 11, ..., 18}.a[1][0]is{10, 11, 12}.a[2]corresponds to the third block:{19, 20, ..., 27}.a[2][0]is{19, 20, 21}.
i from 0 to 2 and k from 0 to 2, while j is fixed at 0.- When
i=0, it printsa[0][0][0],a[0][0][1],a[0][0][2], which are1, 2, 3. - When
i=1, it printsa[1][0][0],a[1][0][1],a[1][0][2], which are10, 11, 12. - When
i=2, it printsa[2][0][0],a[2][0][1],a[2][0][2], which are19, 20, 21.
1 2 3
10 11 12
19 20 21
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