Boolean true false and Logical Operators in C

Learn about Boolean values and logical operators in C. This tutorial explains how true/false work and covers &&, ||, and ! with examples on Debian 12 using Vim.

Boolean and Logical Operators in C

In C, Boolean values represent truth using integers: 0 for false and any non-zero value for true. Logical operators allow you to combine or invert these conditions.

Boolean Values in C

C does not have a native boolean type in older standards. Instead, it uses:

• 0: Represents false.
• Non-zero: Represents true (commonly 1).

In modern C (C99 and later), you can use #include to get true and false keywords.

Logical Operators

• && (Logical AND): True if both conditions are true.
• || (Logical OR): True if at least one condition is true.
• ! (Logical NOT): Inverts the truth value.

Example Program: Boolean and Logical Operators

This program demonstrates Boolean logic and all logical operators.

#include 
#include 

int main()  y);
    printf(\\"NOT x: %d\\\
\\", !x);
    printf(\\"NOT y: %d\\\
\\", !y);

    return 0;

Step-by-Step Explanation

• x && y: True only if both x and y are true. Result: 0 (false).
• x || y: True if either x or y is true. Result: 1 (true).
• !x: Negates x. Since x is true, result: 0 (false).
• !y: Negates y. Since y is false, result: 1 (true).

Compiling and Running

Compile and run on Debian 12:

gcc logic.c -o logic
./logic

Expected Output

x AND y: 0
x OR y: 1
NOT x: 0
NOT y: 1

Conclusion

Logical operators make your C programs smarter by allowing complex conditions. Practice combining them for more dynamic code.

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