Objective-C 中的逻辑运算符

下表显示了 Objective-C 语言支持的所有逻辑运算符。 假设变量A为1，变量B为0，则 −

示例

尝试以下示例来理解 Objective-C 编程语言中可用的所有逻辑运算符 −

#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" );
   }
}

当你编译并执行上面的程序时，它会产生以下结果 −

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