900个C语言开发的小程序

				#include 
				
				void main(int argc, char **argv)
				 {
				   FILE *input, *output;
				
				   char string[256];
				
				   if ((input = fopen(argv[1], "r")) == NULL)
				     printf("Error opening %s\n", argv[1]); 
				   else if ((output = fopen(argv[2], "w")) == NULL)
				     {
				       printf("Error opening %s\n", argv[2]);
				       fclose(input);
				     }
				   else 
				     {
				       while (fgets(string, sizeof(string), input))
				         fputs(string, output);
				
				       fclose(input);
				       fclose(output);
				     }
				 }