紧急救助!!

紧急救助!!
帮忙分析这个程序,不懂? 谢谢!!
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <string.h>
void encfile(char *in_filename,char *pwd,char *out_filename);
void main(int argc,char *argv[])
{
char in_filename[30];
char out_filename[30];
char pwd[8];
if(argc!=4){
printf("\nPlesae input In-filename:\n");
gets(in_filename);
printf("Plesae input your Password:\n");
gets(pwd);
printf("Plesae input Out-filename:\n");
gets(out_filename);
encfile(in_filename,pwd,out_filename);
}
}
void encfile(char *in_filename,char *pwd,char *out_file)
{
FILE *fp1,*fp2;
register char ch;
int j=0;
int j0=0;
fp1=fopen(in_filename,"rb");
if(fp1==NULL){
printf("cannot open in-file.\n");

#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <string.h>
void encfile(char *in_filename,char *pwd,char *out_filename);
void main(int argc,char *argv[])
{
char in_filename[30];
char out_filename[30];
char pwd[8];
if(argc!=4){
printf("\nPlesae input In-filename:\n");
gets(in_filename);
printf("Plesae input your Password:\n");
gets(pwd);
printf("Plesae input Out-filename:\n");
gets(out_filename);
encfile(in_filename,pwd,out_filename);
}
}
void encfile(char *in_filename,char *pwd,char *out_file)
{
FILE *fp1,*fp2;
register char ch;
int j=0;
int j0=0;
fp1=fopen(in_filename,"rb");
if(fp1==NULL){
printf("cannot open in-file.\n");
exit(1);
}
fp2=fopen(out_file,"wb");
if(fp2==NULL)

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