Logical operators in C

C programming logical operators; Through this tutorial, you will learn in detail about logical operators in c programming and how to use these operators.

Note that:- Logical operators are commonly used in decision-making in C programming.

Logical Operators in C

Logical operators are used to performing logical operations of given expressions (relational expressions) or variables.

Types of Logical Operators in C

See the following table for types of logical operators in c programming:

OperatorMeaningExample
&&Logical AND. True only if all operands are trueIf c = 5 and d = 2 then, expression ((c==5) && (d>5)) equals to 0.
||Logical OR. True only if either one operand is trueIf c = 5 and d = 2 then, expression ((c==5) || (d>5)) equals to 1.
!Logical NOT. True only if the operand is 0If c = 5 then, expression !(c==5) equals to 0.

There are examples of logical operators in C. See the following example:

Example 1 – Logical Operators in C

#include<stdio.h>

int main()
{
    int a = 5, b = 10 ,ret;

    ret = ( (a <= b) || (a != b) );
    // 5 <= 10 ==> true. 5 != 10 ==> true. So, 1 || 1 will return 1.
    printf("Return value of above expression is %d\n",ret);

    ret = ( ( a < b) && (a == b ) );
    // 5 < 10 ==>true. 5 == 10 ==> false. So, 1 && 0 will return 0;
    printf("Return value of above expression is %d\n",ret);

    ret = ! ( ( a < b) && (a == b ) );
    /*we have used the same expression here.
     And its result was 0.
     So !0 will be 1.*/
    printf("Return value of above expression is %d\n",ret);

    return 0;
}

Output

Return value of above expression is 1
Return value of above expression is 0
Return value of above expression is 1

Example 2 – 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 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

Example 3 – Logical Operators in C

// Working of logical operators

#include <stdio.h>
int main()
{
    int a = 5, b = 5, c = 10, result;

    result = (a == b) && (c > b);
    printf("(a == b) && (c > b) is %d \n", result);

    result = (a == b) && (c < b);
    printf("(a == b) && (c < b) is %d \n", result);

    result = (a == b) || (c < b);
    printf("(a == b) || (c < b) is %d \n", result);

    result = (a != b) || (c < b);
    printf("(a != b) || (c < b) is %d \n", result);

    result = !(a != b);
    printf("!(a != b) is %d \n", result);

    result = !(a == b);
    printf("!(a == b) is %d \n", result);

    return 0;
}

Output

(a == b) && (c > b) is 1
(a == b) && (c < b) is 0
(a == b) || (c < b) is 1
(a != b) || (c < b) is 0
!(a != b) is 1
!(a == b) is 0 

AuthorDevendra Dode

Greetings, I'm Devendra Dode, a full-stack developer, entrepreneur, and the proud owner of Tutsmake.com. My passion lies in crafting informative tutorials and offering valuable tips to assist fellow developers on their coding journey. Within my content, I cover a spectrum of technologies, including PHP, Python, JavaScript, jQuery, Laravel, Livewire, CodeIgniter, Node.js, Express.js, Vue.js, Angular.js, React.js, MySQL, MongoDB, REST APIs, Windows, XAMPP, Linux, Ubuntu, Amazon AWS, Composer, SEO, WordPress, SSL, and Bootstrap. Whether you're starting out or looking for advanced examples, I provide step-by-step guides and practical demonstrations to make your learning experience seamless. Let's explore the diverse realms of coding together.

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