邏輯運算子

1. 邏輯運算子 (Logical Operators) 說明

   符號	意義	範例	說明
   &&	AND	a&&b	a AND b
   ||	OR	a||b	a OR b
   !	NOT	!a	NOT a

2. 實例說明：

   [dywang@dyw219 zzz]$ vim op-log1.c 
   [dywang@dyw219 zzz]$ cat op-log1.c 
   #include <stdio.h>
   
   main() {
       int a, b;
   
       printf("Enter TWO integers: ");
       scanf("%d %d", &a, &b);
   
       if ( a>0 && b>0 ) printf("%d>0 AND %d>0\n", a, b );
       if ( a>0 || b>0 ) printf("%d>0 OR %d>0\n", a, b );
       if ( !( a>0 ) ) printf("NOT %d>0\n", a );
   }
   

3. 編譯成功

   [dywang@dyw219 zzz]$ gcc -o op-log1 op-log1.c
   

4. 執行結果一

   [dywang@dyw219 zzz]$ ./op-log1 
   Enter TWO integers: 2 3
   2>0 AND 3>0
   2>0 OR 3>0
   

5. 執行結果二

   [dywang@dyw219 zzz]$ ./op-log1 
   Enter TWO integers: 2 -3
   2>0 OR -3>0
   

6. 執行結果三

   [dywang@dyw219 zzz]$ ./op-log1 
   Enter TWO integers: -2 5
   -2>0 OR 5>0
   NOT -2>0