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"Logical operators help in decision-making by evaluating multiple conditions at once."

What Are Logical Operators?

Logical operators are used to combine multiple conditions and return a boolean result (1 for true and 0 for false).

List of Logical Operators

Examples of Logical Operators

1. Using Logical Operators in Conditional Statements

#include <stdio.h>

int main() {
int age = 20;
int hasID = 1;

if (age >= 18 && hasID) {
	printf("You are eligible to vote.\n");
} else {
	printf("You are not eligible to vote.\n");
}

return 0;
}

2. Logical OR Operator

#include <stdio.h>

int main() {
int isRaining = 1;
int hasUmbrella = 0;

if (isRaining || hasUmbrella) {
	printf("You can go outside.\n");
} else {
	printf("Better stay indoors.\n");
}

return 0;
}

3. Logical NOT Operator

#include <stdio.h>

int main() {
int isWeekend = 0;

if (!isWeekend) {
	printf("Go to work!\n");
} else {
	printf("Enjoy the weekend!\n");
}

return 0;
}

Important Notes on Logical Operators

• Short-Circuit Evaluation: - In a && b, if a is false, b is not evaluated. - In a || b, if a is true, b is not evaluated.
• Logical NOT (!): Converts true to false and false to true.
• Use Parentheses: Group complex conditions with parentheses to improve readability.

Best Practices for Using Logical Operators

• Use && for checking multiple **must-be-true** conditions.
• Use || for checking if **at least one condition is true**.
• Use ! carefully to avoid confusion with negations.

Example: Nested Logical Conditions

#include <stdio.h>

int main() {
int age = 25;
int hasLicense = 1;
int isSober = 1;

if (age >= 18 && hasLicense && isSober) {
	printf("You can drive.\n");
} else {
	printf("You cannot drive.\n");
}

return 0;
}

Conclusion

Logical operators play a crucial role in decision-making and control structures in C. Understanding their behavior will help in writing efficient and error-free programs! 🚀

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