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                #### 29. 命令行參數 執行程序時,可以從命令行傳值給 C 程序。這些值被稱為**命令行參數**,它們對程序很重要,特別是當您想從外部控制程序,而不是在代碼內對這些值進行硬編碼時,就顯得尤為重要了。 命令行參數是使用 main() 函數參數來處理的,其中,**argc** 是指傳入參數的個數,**argv\[\]** 是一個指針數組,指向傳遞給程序的每個參數。下面是一個簡單的實例,檢查命令行是否有提供參數,并根據參數執行相應的動作: ~~~ void main(int argc , char *argv[]){ if (argc ==1){ printf("argv[%d] == %d",0,*argv[0]); } else if (argc ==2){ printf("argv[%d] == %d",1,*argv[1]); } else{ printf("匹配失敗..."); } } ~~~ 輸出: ~~~ argv[0] == 47 ~~~
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