C语言编写的程序中也可以实现，灵活地运用命令行参数效地程序的运行效率，收到事倍的效果。C语言中有命令行参数涉及到程序的主函数main(int argc,char *argv[]这样两个参数，其中，int argc表示命令行参数的个数(包括可执行程序名本身)，char *每个参数的具体内容，argv[0]为命令行执行程序名本身，[1]为命令行中第二个参数的内容，依次类推。如下例输出命令行参数的个数及参数的内容：
main (int argc,char *argv[]，I=0;while(argc>=1)
命令行参数用的最多还是在诸如DIR A：等之类带有盘符、路径或件名令行中，所以说灵活处理这一类参数才能有效地提高程序的运行效果。譬如DIR命令，其后可以是盘符，可以是路径，也可以是文件名，如何区一参数呢?请看下例(此模拟DIR命令，程序要求在命令行输入一个参数：盘符或路径或文件名或参数多于一个都将取默认的参数“*.*”)。
\*--------------------
功能：模拟DIR命令进行处理命令行参数
--------------------*/#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) /*取命令行参数到数组中*/stcpy(ss,argv[1]);elsestrcpy(ss,″*.*″); /*给数组赋省参数*/if (((ss[strlen(ss)-1]==′\\′||((ss[strlen(ss)-1]==‘:‘))strcat(ss,″*.*″); /*若参数为路径或盘符，则加上″*.*″ */getcwd(pat1,50); /*取当前径*/if (chdir(ss)==0)
/*判断参数是路径*/strcat(ss,\\*.*); /*若路径末没有带\，则加上*.* */chdir(path1); /*恢复原来路径*/
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