符號 | 意義 | 範例 | 說明 |
+ |
正號 | +6 |
正6,與 6 一樣,所以比較不常用。 |
- |
負號 | -6 |
負6 |
! |
NOT | !b |
變數 b 取 NOT |
[dywang@dyw219 zzz]$ vim op-un1.c [dywang@dyw219 zzz]$ cat op-un1.c #include <stdio.h> main() { int a, c=-6; a = +c; printf("a = +c = %d\n", a); a = -c; printf("a = -c = %d\n", a); a = !c; printf("a = !c = %d\n", a); }
[dywang@dyw219 zzz]$ gcc -o op-un1 op-un1.c
[dywang@dyw219 zzz]$ ./op-un1 a = +c = -6 a = -c = 6 a = !c = 0