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.

Logical Operator Table:

Logical AND Operator

Let us write a C program to demonstrate logical AND operator

#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;
}

Logical OR Operator

Let us write a C program to demonstrate logical OR operator

#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;
}

Logical NOT Operator

Let us write a C program to demonstrate logical NOT operator

#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;
}

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