Relational Operator & Logical Operators

Relational Operator : (>,<,>=,<=,==)

It is also known as Comparision operator

true = 1
false = 0

1. greater than (>)

  ex. a = 10;
  b = 20;
  a > b
 10 > 20
the result will be false

Example 1 :

#include <iostream>
using namespace std;

int main() {

    int a = 10;

    int b = 20;

    int res = a>b;

    cout<<res;

    return 0;
}

Output :

0

Explanation :

Line 6 : Initialized the 10 value in variable a.
Line 8 : Initialized the 20 value in variable b.
Line 10 : To declare the res variable and check the condition a>b.
Line 12 : Print the res using cout. And result will be false.

2. less than (<)

a = 50;
b = 20;
a < b;
50 < 20
the result will be true

Example 2 :

#include <iostream>
using namespace std;

int main() {

    int a = 50;

    int b = 20;

    int res = a<b;

    cout<<res;

    return 0;
}

Output :

1

Explanation :

Line 6 : Initialized the 50 value in variable a.
Line 8 : Initialized the 20 value in variable b.
Line 10 : To declare the res variable and check the condition a<b.
Line 12 : Print the res using cout. And result will be true.

3. greater than or equal to (>=)

a = 10;
b = 5;
a >= b;
10 >=5;

 F F = F
 T F = T
 F T = T

Example 3 :

#include <iostream>
using namespace std;

int main() {

    int a = 10;

    int b = 5;

    int res = a>=b;

    cout<<res;

    return 0;
}

Output :

1

Explanation :

Line 6 : Initialized the 10 value in variable a.
Line 8 : Initialized the 5 value in variable b.
Line 10 : To declare the res variable and check the condition a>=b.
Line 12 : Print the res using cout. And result will be true.

4. less than or equal to (<=)

a = 20;
b = 20;
a <= b;
20 <=20;
true

Example 4 :

#include <iostream>
using namespace std;

int main() {

    int a = 20;

    int b = 20;

    int res = a<=b;

    cout<<res;

    return 0;
}

Output :

1

Explanation :

Line 6 : Initialized the 20 value in variable a.
Line 8 : Initialized the 20 value in variable b.
Line 10 : To declare the res variable and check the condition a<=b.
Line 12 : Print the res using cout. And result will be true.

5. equal to (==)

Note :
= value to assign
== two value equal or not

Example 5 :

#include <iostream>
using namespace std;

int main() {

    int a = 20;

    int b= 20;

    int res = a==b;

    cout<<res;

    return 0;
}

Output :

1

Explanation :

Line 6 : Initialized the 20 value in variable a.
Line 8 : Initialized the 20 value in variable b.
Line 10 : To declare the res variable and check the condition a==b.
Line 12 : Print the res using cout. And result will be true.

Logical Operator ( &&, ||, ! )

Logical AND  => &&
Logical OR =>  ||
Logical NOT(Negation) => !

1. Logical AND (&&)

Both the conditions have to be checked wether it is true or false then use logical AND operator.

Truth table
condition 1  &&  condition 2
    T    T  =  T
    T    F  =  F
    F    T  =  F
    F    F  =  F

Example 6 :

#include <iostream>
using namespace std;

int main() {

    int a = 10;

    int b= 20;

    int res = a==10 && b==30;

    cout<<res;

    return 0;
}

Output :

0

Explanation :

Line 6 : Initialized the 10 value in variable a.
Line 8 : Initialized the 20 value in variable b.
Line 10 : To declare the res variable and check the condition a==10 && b==30.
Line 12 : Print the res using cout. And result will be false.

Relational Operator & Logical Operators