C Programming Questions and Answers – Multidimensional Arrays
C Programming Questions and Answers – Multidimensional Arrays
1.What is the output of this C code?
#include <stdio.h>
void main()
{
int a[2][3] = {1, 2, 3, 4, 5};
int i = 0, j = 0;
for (i = 0; i < 2; i++)
for (j = 0; j < 3; j++)
printf(“%d”, a[i][j]);
}
a) 1 2 3 4 5 0
b) 1 2 3 4 5 junk
c) 1 2 3 4 5 5
d) Run time error
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Answer:a
2.What is the output of this C code?
#include <stdio.h>
void main()
{
int a[2][3] = {1, 2, 3, , 4, 5};
int i = 0, j = 0;
for (i = 0; i < 2; i++)
for (j = 0; j < 3; j++)
printf(“%d”, a[i][j]);
}
a) 1 2 3 junk 4 5
b) Compile time error
c) 1 2 3 0 4 5
d) 1 2 3 3 4 5
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Answer:b
3.What is the output of this C code?
#include <stdio.h>
void f(int a[][3])
{
a[0][1] = 3;
int i = 0, j = 0;
for (i = 0; i < 2; i++)
for (j = 0; j < 3; j++)
printf(“%d”, a[i][j]);
}
void main()
{
int a[2][3] = {0};
f(a);
}
a) 0 3 0 0 0 0
b) Junk 3 junk junk junk junk
c) Compile time error
d) All junk values
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Answer:a
4.What is the output of this C code?
#include <stdio.h>
void f(int a[][])
{
a[0][1] = 3;
int i = 0, j = 0;
for (i = 0;i < 2; i++)
for (j = 0;j < 3; j++)
printf(“%d”, a[i][j]);
}
void main()
{
int a[2][3] = {0};
f(a);
}
a) 0 3 0 0 0 0
b) Junk 3 junk junk junk junk
c) Compile time error
d) All junk values
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Answer:c
5.What is the output of this C code?
#include <stdio.h>
void f(int a[2][])
{
a[0][1] = 3;
int i = 0, j = 0;
for (i = 0;i < 2; i++)
for (j = 0;j < 3; j++)
printf(“%d”, a[i][j]);
}
void main()
{
int a[2][3] = {0};
f(a);
}
a) 0 3 0 0 0 0
b) Junk 3 junk junk junk junk
c) Compile time error
d) All junk values
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Answer:c
6.Comment on the following statement:
int (*a)[7];
a) An array “a” of pointers.
b) A pointer “a” to an array.
c) A ragged array.
d) None of the mentioned
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Answer:b
7.Comment on the 2 arrays regarding P and Q:
int *a1[8];
int *(a3[8]);
Array of pointers
Pointer to an array
a) a1 is P, a2 is Q
b) a1 is P, a2 is P
c) a1 is Q, a2 is P
d) a1 is Q, a2 is Q
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Answer:b
8.Which of the following is not possible statically in C?
a) Jagged Array
b) Rectangular Array
c) Cuboidal Array
d) Multidimensional Array
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Answer:a
9.What is the correct syntax to send a 3-dimensional array as a parameter?
(Assuming declaration int a[5][4][3];)
a) func(a);
b) func(&a);
c) func(*a);
d) func(**a);
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Answer:a
Applications of multidimensional array are?
a) Matrix-Multiplication
b) Minimum Spanning Tree
c) Finding connectivity between nodes
d) All of the mentioned
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Answer:d
10.What is the output of this C code?
#include <stdio.h>
int main()
{
int ary[2][3];
foo(ary);
}
void foo(int *ary[])
{
int i = 10, j = 2, k;
ary[0] = &i;
ary[1] = &j;
*ary[0] = 2;
for (k = 0;k < 2; k++)
printf(“%d\n”, *ary[k]);
}
a) 2 2
b) Compile time error
c) Undefined behaviour
d) 10 2
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Answer:a
11.What is the output of this C code?
#include <stdio.h>
int main()
{
int ary[2][3];
foo(ary);
}
void foo(int (*ary)[3])
{
int i = 10, j = 2, k;
ary[0] = &i;
ary[1] = &j;
for (k = 0;k < 2; k++)
printf(“%d\n”, *ary[k]);
}
a) Compile time error
b) 10 2
c) Undefined behaviour
d) segmentation fault/code crash
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Answer:a
12.What is the output of this C code?
#include <stdio.h>
int main()
{
foo(ary);
}
void foo(int **ary)
{
int i = 10, k = 10, j = 2;
int *ary[2];
ary[0] = &i;
ary[1] = &j;
printf(“%d\n”, ary[0][1]);
}
a) 10
b) 2
c) Compile time error
d) Undefined behaviour
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Answer:d
13.What is the output of this C code?
#include <stdio.h>
int main()
{
int ary[2][3][4], j = 20;
ary[0][0] = &j;
printf(“%d\n”, *ary[0][0]);
}
a) Compile time error
b) 20
c) Address of j
d) Undefined behaviour
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Answer:a
14.What is the output of this C code?
#include <stdio.h>
int main()
{
int ary[2][3];
ary[][] = {{1, 2, 3}, {4, 5, 6}};
printf(“%d\n”, ary[1][0]);
}
a) Compile time error
b) 4
c) 1
d) 2
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Answer:a