编写一段程序，依次在屏幕上显示命令行中列出的全部文件。使用a

#include<stdio.h>
#include<stdlib.h>
int main(int argc,char *argv[])
{
 int i,n=argc;
 char str[100];
 FILE *fp;
 for(i=1; i<4; i++)
 {
 printf("\nFILE %d -- %s:\n",i,argv[i]);
 if ( (fp = fopen(argv[i],"r")) == NULL)
 {
 printf ("Can't open %s\n", argv[i]);
 exit(1);
 }
 while(fscanf(fp,"%s",str)!=EOF)
 fprintf(stdout,"%s",str);
 fclose(fp);
 }
 return 0;
}