C Foundation

What is C? C Compiler Installation C Extensions C Compiler C Interpreter C Program Structure

C Basics

C Keywords C Data Types C Identifiers C Variables C Constant C Escape Sequences C Constant and Volatile C Typecast

Operators

What is Operator C Comma Operator C Arithmetic Operators C Relational Operators C Logical Operators C Bitwise Operators C Conditional Operators C : : Operator C Operator Priority

Basic IO's

Basic IO's C Formatted Functions C Unformatted Functions C Common Functions

Control Statements

What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement

Looping

What is Control Loop C for Loop C Nested for Loop C while Loop C Nested while Loop C do while Loop C Nested do while loop

Functions

What is Function C User Defined Functions C Recursion C Passing Parameters

Scope

Scope C Local Scope C Global Scope

Storage Classes

What is Storage Class C Auto C Extern C Static C Register

Array

What is Array C One Dimensional Array C Two Dimensional Array C Multi Dimensional Array C Arrays Of Strings

String

What is String C String Functions

Pointer

What is Pointer C Pointers Arithmetic C Pointer to Pointer C Pointers and Arrays C Pointers and Strings C Pointer to Functions Void Pointers Null Pointers C Null and Void Pointer

Structure

What is Structure C Struct within Struct C Array within Structure C Pointer to Structure C Structure and Function C Enum C Bitfield Structure C Type def

Union

What is Union

Files

What is File C read a file C write a file C File Handling C Error Handling C Low Level Disk I/O C Other file functions

Memory Allocation

What is Memory Allocation C Malloc() C Calloc() C Free() C Realloc() C Coreleft()

C Reference

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C Interview

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The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

C Logical Operators

Why Logical Operator?

By learning relational operator, you should have a general idea how to use conditions in if statements by now, but imagine if you what to check two condition to execute certain sets of statement. what you will be doing there

Option A

  • Using nested if statement( 2 if statements one after another) to evaluate two condition.

Option B

  • Make use of Logical Operators

Answer

Though option A looks classic it fails in either or condition. In such case you are insisted to make use of Logical Operators with no choices.

Logical Operator in C

  • Logical operators are used to check (or) compare the logical relations between the expressions.
  • Logical operator, returns 1 if given condition is true, 0 if given condition is false.

Logical Operator flow

C provides 3 logical operator for comparing numeric quantities.

arithmetic_operator

Logical Operator Table:

Operator Description Example Return Value
&& Logical AND 7 > 3 && 8 > 5 1
|| Logical OR 7 > 3 || 8<5 1
! Logical NOT 5 != 5 0

Logical AND Operator

Let us write a C program to demonstrate logical AND operator

logicaland.c
#include <stdio.h>
int main()
{
int a = 20;
int b = 10;
int c = 15;
if(a<b && b<c)
printf(" C is the greatest number of all");
else
printf(" C is not greatest number of all");
return 0;
}
  • C is not greatest number of all

Note:

Here printf statement next to if conditional statement will execute only both conditions inside if statement is true otherwise else part will be executed.

Logical OR Operator

Let us write a C program to demonstrate logical OR operator

logicalor.c
#include <stdio.h>
int main()
{
int a = 20;
int b = 10;
int c = 15;
if(c>a || c>b)
printf(" C is not smallest and may not biggest of all ");
else
printf(" C is smallest of all");
return 0;
}
  • C is not smallest and may not biggest of all

Note:

Here printf statement next to if conditional statement will execute even either condition is true.

Logical NOT Operator

Let us write a C program to demonstrate logical NOT operator

logicalnot.c
#include <stdio.h>
int main()
{
int a = 20;
int b = 10;
if(a != b )
printf("a is not equal to b");
else
printf(" a is equal to b");
return 0;
}
  • a is not equal to b

Note:

Here printf statement next to if conditional statement executes as a and b are different in numbers.

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