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C Institute | Questions

This section on C interview questions, tricky questions, and puzzles focuses on “Relational operators”. One shall practice these questions and puzzles to improve their C programming skills needed for various interviews (campus interviews, walk-in interviews, viva exams and company interviews), placements, entrance exams and other competitive exams. These programming questions can be attempted by anyone focusing on learning C Programming language. They can be a beginner, fresher, engineering graduate, engineering student, bca student, mca student, mcs students or an experienced IT professional. Here is a listing of C questions and puzzles on “Relational operators” along with answers and/or explanations.

```Q1: What will be the output of the following C code?

#include <stdio.h>
int main()
{
int x = 20, y = 10, z = 10;
int p;
p = y + z == x;
printf("%d", p);
return 0;
}```
a)  10
b)  Syntax Error
c)  1
d)  0
Correct Answer : c
Explanation : Due to operator precedence the arithmetic operator is solved first, then relational , and at last assignment.

```Q2: What will be the output of following C code?
#include <stdio.h>
int main()
{ int p = 100, q = 200, r = 300;
if (r > q > p)
printf("true");
else
printf("not true");
return 0;
} ```
a)  true
b)  not true
c)  Compile Time Error
d)  Runtime Error
Correct Answer : b
Explanation : Let us understand the condition inside the if . Since there are two greater than (>) operators in expression “r > q > p”, associativity of > is considered. Associativity of > is left to right. So, expression r > q > p is evaluated as ( (r > q) > p ) which is false.

```Q3: What will be the output?
#include <stdio.h>
void main()
{  int a=3,b=2;
a=a==b==0;
printf("%d,%d",a,b);
return 0;
}```
a)  3,1
b)  3,2
c)  2,1
d)  1,2
Correct Answer : d
Explanation : First a==b results in 0, then 0==0 results in 1, so 1 is assigned to a, and b remains 2.