Logical and Ternary Operator

2. Logical OR (||)

condition-1  ||  condition-2
   T   ||   F   =  T
   T   ||   T   =  T
   T   ||   T   =  T
   F   ||   F   =  F

Example 1 :

#include <iostream>
using namespace std;

int main() {

   int jee = 130;
   int cet = 20;

   int res = jee > 120 || cet > 200;

   cout<<res;

   return 0;
}

Output :

1

Explanation :

Line 6 : Initialized the 130 value in variable jee.
Line 8 : Initialized the 20 value in variable cet.
Line 10 : To declare the res variable and check the condition jee > 130 || cet > 20.
Line 12 : Print the res using cout And result will be True.

Example 2 :

#include <iostream>
using namespace std;

int main() {

  int jee = 125;

  int cet = 220;

  int res = jee >= 120 || cet >= 200;

  cout<<res;

  return 0;
}

Output :

1

Logical NOt (!)

reverse the boolean value.

!true = false
!false = true

Example 3 :

#include <iostream>
using namespace std;

int main() {

  int jee = 0;

  int res = !( jee >= 120 );

  cout<<res;

  return 0;
}

Output :

1

Ternary operator

example :
condition ? true part : false part

Example 5 :

#include <iostream>
using namespace std;

int main() {

    int num;
   cout<<"enter a Number :";
   cin>>num;

   num==100 ? cout<<"Equal" : cout<<"Not Equal";

   return 0;
}

Output :

Enter a Number : 20

Not Equal

Explanation :

Line 8 : Enter a num from user .
Line 9 : allocate memory for num variable.
Line 11 : num == 100 check this condition and then print the Eqaul part or Not Equal depend on condition.

Example 6 :

#include <iostream>
using namespace std;

int main() {

   int number;

   cout<<"Enter a number :";
   cin>>number;

   number % 2 == 0 ? cout<<"Even" : cout<<"Odd";

   return 0;
}

Output :

Enter a number : 10

Even

Explanation :

Line 8 : Enter a number from user .
Line 9 : allocate memory for number variable.
Line 11 : number % 2 == 0 check this condition and then print the Even part or odd depend on condition.