## C – Logical Operators

#### Logical operators in C:

• These operators are used to perform logical operations on the given expressions.
• There are 3 logical operators in C language. They are, logical AND (&&), logical OR (||) and logical NOT (!).
 S.no Operators Name Example Description 1 && logical AND (x>5)&&(y<5) It returns true when both conditions are true 2 || logical OR (x>=10)||(y>=10) It returns true when at-least one of the condition is true 3 ! logical NOT !((x>5)&&(y<5)) It reverses the state of the operand “((x>5) && (y<5))” If “((x>5) && (y<5))” is true, logical NOT operator makes it false

#### Example program for logical operators in C:

```#include <stdio.h>
int main()
{
int m=40,n=20;
int o=20,p=30;

if (m>n && m !=0)
{
printf("&& Operator : Both conditions are truen");
}
if (o>p || p!=20)
{
printf("|| Operator : Only one condition is truen");
}
if (!(m>n && m !=0))
{
printf("! Operator  : Both conditions are truen");
}
else
{
printf("! Operator  : Both conditions are true. "
"But, status is inverted as   falsen");
}
}```

#### Output:

 && Operator : Both conditions are true || Operator : Only one condition is true ! Operator : Both conditions are true. But, status is inverted as false
• In this program, operators (&&, || and !) are used to perform logical operations on the given expressions.
• && operator – “if clause” becomes true only when both conditions (m>n and m! =0) is true. Else, it becomes false.
• || Operator – “if clause” becomes true when any one of the condition (o>p || p!=20) is true. It becomes false when none of the condition is true.
• ! Operator  – It is used to reverses the state of the operand.
• If the conditions (m>n && m!=0) is true, true (1) is returned. This value is inverted by “!” operator.
• So, “! (m>n and m! =0)” returns false (0).

……

#### Continue on types of C operators:

• Click on each operators name below to display example programs.
 S.no Types of Operators Description 1 Arithmetic_operators These are used to perform mathematical calculations like addition, subtraction, multiplication, division and modulus 2 Assignment_operators These are used to assign the values for the variables in C programs. 3 Relational operators These operators are used to compare the value of two variables. 4 Logical operators These operators are used to perform logical operations on the given two variables. 5 Bit wise operators These operators are used to perform bit operations on given two variables. 6 Conditional (ternary) operators Conditional operators return one value if condition is true and returns another value is condition is false. 7 Increment / decrement operators These operators are used to either increase or decrease the value of the variable by one. 8 Special operators &, *, sizeof( ) and ternary operators

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