Relational and Logical Operator

Relational  Operator 

1. equality operator (==)

2. not equal ( !=)

3. less than 

4..greater than 

5. less than equal to 

6. greater than equal to 

1. Equality operator (==)

#include<stdio.h>
int main()
{
int a=5,b=10;
if(a==b)
printf("a and b is equal ");
else
printf("a and b is not equal ");
return 0;
}

2. not equal ( !=)
#include<stdio.h>
int main()
{
int a=5,b=10;
if(a!=b)
printf("a and b is not equal ");
else
printf("a and b is  equal ");
return 0;

}

Output :

a and b is not equal

Logical Operator 

1. Logical AND (&&)

2. Logical OR (||)

3. Logical NOT (!)

Logical AND 

#include<stdio.h>

int main()

{

int a=5,b=10;

if(a==10&&a==5)

printf("AND condition satisfy");

else

printf("AND condition not satisfy");

return 0;

}

Output : 

AND condition not satisfy

Logical  OR (||)

#include<stdio.h>

int main()

{

int a=5,b=10;

if(a==10||a==5)

printf("OR condition satisfy");

else

printf("OR condition not satisfy");

return 0;

}

Output:

OR condition satisfy

3. Logical NOT (!)

#include<stdio.h>

int main()

{

int a=5,b=10;

if(!a)

printf("Yes");

else

printf("No");

return 0;

}

Output :

No

 MCQ 

1.  The result of a Relational operation is always

 A) either True or False

 B) is less than or is more than

 C) is equal or less or more

 D) All of the above

2  23  f i = 8 and j = 5 are two integers, then the value of (i>0) || (j < 5) is

    A)  -5

    B)  1

    C)  0

    D)   5

  3 What would be value of j after the following is executed?

 k=17; j=6; if (k < 10) j=8; j=j+1; j=j+2;

A) 8

B) 9

C) 7

D) 10

4  Which of the following is not a valid relational operator?

A)  <

B)   =

C)   >=

D)   <=

5  What will be the output of the following ‘C’ program

 main()

 {

 int a=5;

 float b=5.0;

if(a==b)

printf(“a and b are equal”);

else

 printf(“a and b are different”); 
}

A)  a and b are equal

B)   B) a and b are different

C)  C) Error

D)   D) None of the above

6  What will be the output of the following ‘C’ program?

main()

 {
 int a=1;

int b=5;

if(a=5||b>10)

printf(“I will certainly pass”);

else

printf(“I am not so sure about the result”); }

A) I will certainly pass

B) I am not so sure about the result

C) Error

D) None of the above

7  The && and | | operators

A) compare two numeric values

B) combine two numeric values

C) compare two boolean values

D) None of the above

8 What is the output of the following program segment?

#include main()

{

 int i=10, m=10;

clrscr();

printf(“%d”, i>m?i*i:m/m,20);

getch();

}

A)  20

B)  1

C)  120

D)  100 20

9  The && and || operators

A) compare two numeric values

B) combine two numeric values

C) compare two Boolean values

D) combine two Boolean values

10  The value of variable x after executing the following code will be: val = -200; x = (val >= 0 ) ? val : -val

A) 0

B) 200

C) –200

D) 1

11  What is the value of r after this code is executed? r=2; k=8; if (r>3 || k>6 && r 10) r=50; else r=9

A) 9

 B) 2

C) 6

D) 50

True/False
1. Every ‘if’ statement must also include ‘else’.

22.   The expression on the right hand side of && and || operators does not get evaluated if the left hand side determines the outcome.