C代碼程式功能開發用keil編程

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C語言編寫的程式中也可以實現，靈活地運用命令列參數效地程式的運行效率，收到事倍的效果。C語言中有命令列參數涉及到程式的主函數main(int argc,char *argv[]這樣兩個參數，其中，int argc表示命令列參數的個數(包括可執行程式名本身)，char *每個參數的具體內容，argv[0]為命令列執行程式名本身，[1]為命令列中第二個參數的內容，依次類推。如下例輸出命令列參數的個數及參數的內容：main (int argc,char *argv[]，I=0;while(argc>=1)命令列參數用的最多還是在諸如DIR A：等之類帶有盤符、路徑或件名令行中，所以說靈活處理這一類參數才能有效地提高程式的運行效果。譬如DIR命令，其後可以是盤符，可以是路徑，也可以是檔案名稱，如何區一參數呢?請看下例(此類比DIR命令，程式要求在命令列輸入一個參數：盤符或路徑或檔案名稱或參數多於一個都將取預設的參數“*.*”)。\*--------------------功能：類比DIR命令進行處理命令列參數--------------------*/#include#include#include#incdeint j,num=0;char ss[20],path[50],path2[50];void main (int argc,char *argv[]){struct ffblk f;int done;if(argc==2) 　/*取命令列參數到數組中*/stcpy(ss,argv[1]);elsestrcpy(ss,″*.*″); /*給數組賦省參數*/if (((ss[strlen(ss)-1]==′\\′||((ss[strlen(ss)-1]==‘:‘))strcat(ss,″*.*″); /*若參數為路徑或盤符，則加上″*.*″　*/getcwd(pat1,50); /*取當前徑*/if (chdir(ss)==0) /*判斷參數是路徑*/strcat(ss,\\*.*); /*若路徑末沒有帶\，則加上*.* */chdir(path1); /*恢複原來路徑*/

 

 

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C代碼程式功能開發用keil編程