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C Programming Questions and Answers – Relational & Logical Operators 

C Programming Questions and Answers – Relational & Logical Operators

1.What is the output of this C code?

#include <stdio.h>

void main()

{

int x = 1, y = 0, z = 5;

int a = x && y || z++;

printf(“%d”, z);

}

a) 6

b) 5

c) 0

d) Varies

View Answer

Answer:a 

 

2.What is the output of this C code?

#include <stdio.h>

void main()

{

int x = 1, y = 0, z = 5;

int a = x && y && z++;

printf(“%d”, z);

}

a) 6

b) 5

c) 0

d) Varies

View Answer

Answer:b  

3.What is the output of this C code?

#include <stdio.h>

int main()

{

int x = 1, y = 0, z = 3;

x > y ? printf(“%d”, z) : return z;

}

a) 3

b) 1

c) Compile time error

d) Run time error

View Answer

Answer:c

4.What is the output of this C code?

#include <stdio.h>

void main()

{

int x = 1, z = 3;

int y = x << 3;

printf(” %d\n”, y);

}

a) -2147483648

b) -1

c) Run time error

d) 8

View Answer

Answer:d 

 

5.What is the output of this C code?

#include <stdio.h>

void main()

{

int x = 0, y = 2, z = 3;

int a = x & y | z;

printf(“%d”, a);

}

a) 3

b) 0

c) 2

d) Run time error

View Answer

Answer:a 

 

6.What is the final value of j in the below code?

#include <stdio.h>

int main()

{

int i = 0, j = 0;

if (i && (j = i + 10))

//do something

;

}

a) 0

b) 10

c) Depends on the compiler

d) Depends on language standard

View Answer

Answer:a

7.What is the final value of j in the below code?

#include <stdio.h>

int main()

{

int i = 10, j = 0;

if (i || (j = i + 10))

//do something

;

}

a) 0

b) 20

c) Compile time error

d) Depends on language standard

View Answer

Answer:a   

 

8.What is the output of this C code?

#include <stdio.h>

int main()

{

int i = 1;

if (i++ && (i == 1))

printf(“Yes\n”);

else

printf(“No\n”);

}

a) Yes

b) No

c) Depends on the compiler

d) Depends on the standard

View Answer

Answer:b

9.Are logical operators sequence points?

a) True

b) False

c) Depends on the compiler

d) Depends on the standard

View Answer

Answer:a 

 

10.Does logical operators in C language are evaluated with short circuit?

a) True

b) False

c) Depends on the compiler

d) Depends on the standard

View Answer

Answer:a 

11.Result of a logical or relational expression in C is

a) True or False

b) 0 or 1

c) 0 if expression is false and any positive number if expression is true

d) None of the mentioned

View Answer

Answer:b 

 

12.What will be the value of d in the following program?

#include <stdio.h>

int main()

{

int a = 10, b = 5, c = 5;

int d;

d = b + c == a;

printf(“%d”, d);

}

a) Syntax error

b) 1

c) 5

d) 10

View Answer

 

Answer:b 

13.What is the output of this C code?

#include <stdio.h>

int main()

{

int a = 10, b = 5, c = 3;

b != !a;

c = !!a;

printf(“%d\t%d”, b, c);

}

a) 5 1

b) 0 3

c) 5 3

d) 1 1

View Answer

Answer:a

 

14.Which among the following is NOT a logical or relational operator?

a) !=

b) ==

c) ||

d) =

View Answer

Answer:d 

15.What is the output of this C code?

#include <stdio.h>

int main()

{

int a = 10;

if (a == a–)

printf(“TRUE 1\t”);

a = 10;

if (a == –a)

printf(“TRUE 2\t”);

}

a) TRUE 1

b) TRUE 2

c) TRUE 1 TRUE 2

d) Compiler Dependent

View Answer

Answer:d

Explanation: This is a sequence point problem and hence the result will be implementation dependent

16.Relational operators cannot be used on:

a) structure

b) long

c) strings

d) float

View Answer

Answer: a 

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