Assigment Operators & Expressions – C Programming Interview Questions and Answers

Question 1

What is the output of this C code?

#include 
void main()
{
int x = 0;
if (x = 0)
printf("Its zero\n");
else
printf("Its not zero\n");
}

A	Its not zero
B	Its zero
C	Run time error
D	None

Question 2

What is the output of this C code?

#include 
void main()
{
int k = 8;
int x = 0 == 1 && k++;
printf("%d%d\n", x, k);
}

A	0 9
B	0 8
C	1 8
D	1 9

Question 3

What is the output of this C code?

#include 
void main()
{
char a = 'a';
int x = (a % 10)++;
printf("%d\n", x);
}

A	6
B	Junk value
C	Compile time error
D	7

Question 4

What is the output of this C code?

#include 
void main()
{
1 < 2 ? return 1: return 2;
}

A	returns 1
B	returns 2
C	Varies
D	Compile time error

Question 5

What is the output of this C code?

#include 
void main()
{
unsigned int x = -5;
printf("%d", x);
}

A	Run time error
B	Aries
C	-5
D	5

Question 6

What is the output of this C code?

#include 
int main()
{
int x = 2, y = 1;
x *= x + y;
printf("%d\n", x);
return 0;
}

A	5
B	6
C	Undefined behaviour
D	Compile time error

Question 7

What is the output of this C code?

#include 
int main()
{
int x = 2, y = 2;
x /= x / y;
printf("%d\n", x);
return 0;
}

A	2
B	1
C	0.5
D	Undefined behaviour

Question 8

What is the output of this C code?

#include 
int main()
{
int x = 1, y = 0;
x &&= y;
printf("%d\n", x);
}

A	Compile time error
B	1
C	0
D	Undefined behaviour

Question 9

What is the type of the below assignment expression if x is of type float, y is of type int?  y = x + y;

A	int
B	float
C	There is no type for an assignment expression
D	double

Question 10

What is the value of the below assignment expression  (x = foo())!= 1 considering foo() returns 2

A	2
B	True
C	1
D	0

Question 11

Operation “a = a * b + a” can also be written as:

A	a *= b + 1;
B	(c = a * b)!=(a = c + a);
C	a = (b + 1)* a;
D	All of the mentioned

Question 12

for c = 2, value of c after c <<= 1;

A	c = 1;
B	c = 2;
C	c = 3;
D	c = 4;

Question 13

What is the output of this C code?

#include 
int main()
{
int a = 1, b = 2;
a += b -= a;
printf("%d %d", a, b);
}

A	1 1
B	1 2
C	2 1
D	2 2

Question 14

What is the output of this C code?

#include 
int main()
{
int a = 4, n, i, result = 0;
scanf("%d", n);
for (i = 0;i < n; i++)
result += a;
}

A	Addition of a and n.
B	Subtraction of a and n.
C	Multiplication of a and n.
D	Division of a and n.

Question 15

Which of the following is an invalid assignment operator?

A	a %= 10;
B	a /= 10;
C	a |= 10;
D	None of the mentioned

Check Your Answers:

  1.  A

  2.  B

  3.  C

  4.  D

  5.  C

  6.  D

  7.  A

  8.  A

  9.  A

10.  A

11.  D

12.  D

13.  C

14.  C

15.  D

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