C Programming Questions and Answers – Relational & Logical Operators – 1

Here is a listing of C interview questions on “Relational & Logical Operators” along with answers, explanations and/or solutions:

1. What will be the output of the following 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

Answer: a
Explanation: None.

2. What will be the output of the following 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

Answer: b
Explanation: None.

3. What will be the output of the following 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

Answer: c
Explanation: None.

4. What will be the output of the following 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

Answer: d
Explanation: None.

5. What will be the output of the following 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

Answer: a
Explanation: None.

6. What will be the final value of j in the following C 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

Answer: a
Explanation: None.

7. What will be the final value of j in the following C 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

Answer: a
Explanation: None.

8. What will be the output of the following 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

Answer: b
Explanation: None.

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