What does a logical operator return for a true condition?

Logical operators are used to perform logical operations of given expressions [relational expressions] or variables.

There are three logical operators available in C. Let’s discuss one by one.

|| [Logical OR] operator

If one of the operands or expressions is true, it will return 1.

If all of them are false, it will return 0.

A

B

A || B

Example

&& [Logical AND] operator

If both left and right operands or expressions are true, it will return true. Otherwise, it will return false.

Note, non-zero value operands are considered as true.

A

B

A && B

Example

! [Logical NOT] operator

Logical NOT operator is used to inverse the current decision. Say, if current state is true, Logical NOT [!] operator will make it false.

A

!A

Example

Sample Program

Example

#include int main[] { int a = 5, b = 10 ,ret; ret = [ [a true. So, 1 || 1 will return 1. printf["Return value of above expression is %d\n",ret]; ret = [ [ a true. 5 == 10 ==> false. So, 1 && 0 will return 0; printf["Return value of above expression is %d\n",ret]; ret = ! [ [ a a && a > 0]{ //do something... }

Note that:

• a && b will return true only when BOTH a AND b are true.
  
• a || b will return true when either a AND/OR b are true.

Challenge
As briefly mentioned in About Programming, computers ultimately calculate just by doing simple logical operation like AND and OR on Logic Gates. While these gates are physical parts of a computer, you can simulate them in software. The NAND gate is a logical gate that returns false only when both its inputs are true. In other cases it returns true. You will simulate a NAND gate in this challenge. Try to do this challenge without using any if statements.

What does a logical operator return for a true condition in C?

Which logical operator returns true if either condition is true?

Which operator returns true if?

What is the operator for a logical AND condition?