Logical Operators in Objective-C

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Following table shows all the logical operators supported by Objective-C language. Assume variable A holds 1 and variable B holds 0, then −

Operator Description Example
&& Called Logical AND operator. If both the operands are non zero then condition becomes true. (A && B) is false.
|| Called Logical OR Operator. If any of the two operands is non zero then condition becomes true. (A || B) is true.
! Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true, then Logical NOT operator will make false. !(A && B) is true.

Example

Try the following example to understand all the logical operators available in Objective-C programming language −

```#import <Foundation/Foundation.h>

int main() {
int a = 5;
int b = 20;

if ( a && b ) {
NSLog(@"Line 1 - Condition is true\n" );
}

if ( a || b ) {
NSLog(@"Line 2 - Condition is true\n" );
}

/* lets change the value of  a and b */
a = 0;
b = 10;

if ( a && b ) {
NSLog(@"Line 3 - Condition is true\n" );
} else {
NSLog(@"Line 3 - Condition is not true\n" );
}

if ( !(a && b) ) {
NSLog(@"Line 4 - Condition is true\n" );
}
}
```

When you compile and execute the above program, it produces the following result −

```2013-09-07 22:35:57.256 demo[19012] Line 1 - Condition is true
2013-09-07 22:35:57.256 demo[19012] Line 2 - Condition is true
2013-09-07 22:35:57.256 demo[19012] Line 3 - Condition is not true
2013-09-07 22:35:57.256 demo[19012] Line 4 - Condition is true
```
objective_c_operators.htm