#include<stdio.h> #include<stdlib.h> void main(int argc,char *argv[]) { FILE *in,*out; if(argc!=3) { printf("you forgot to enter a file name\n"); exit(0); } if((in=fopen(argv[1],"r"))==NULL) { printf("cannot open inflie\n"); exit(0); } if((out=fopen(argv[2],"w"))==NULL) { printf("cannot open inflie\n"); exit(0); } while(!feof(in)) fputc(fgetc(in),out); fclose(in); fclose(out); }
doc:
c:\> copy.exe in.txt out.txt