Logical Operators in C Language

Logical operators in C Language:

• 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 Language:

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

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 language operators:

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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