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/* Note:Your choice is C IDE

×÷Ó㺠Ëæ»úÊý¼ÓÃÜ·¨£¬£¬£¬£¬
ÒÔÏÂÓÐÐí¶à²»¶®£¬Çë½Ìһϣ¬ÇëÖ÷Òâ´úÂë;

*/
#include <stdio.h>
#include <stdlib.h>
union
{
int value;
struct
{
char first;
char second;
}fran;
}num;
main()
{
FILE *fp,*name2; /* name2λ¼ÓÃÜ´æ·ÅµÄÎļþ */
int i,t,len,k1,k2,k3,k4,k5;
float j;
char name1,buf[60000]; /* name1λÓû§ÊäÈëµÄÒª½øÐмÓÃܵÄÎļþ */
printf("\n input filename that you want to lock or open:");
scanf("%s",name1);
if((fp=fopen(name1,"rb"))==NULL) /* ÒÔÖ»¶ÁµÄ·½Ê½´ò¿ªÒ»¸ö¶þ½øÖÆÎļþ */
{
printf("File cannot be opened\n");
exit(1);
}
else
printf("File opened for encrypt\n");
j=filelength(name1);
printf("\ninput key1:");
gets(k1);
printf("\ninput key2:");
gets(k2);
printf("\ninput key3:");
gets(k3);
srand(k1);
for(i=0;i<k2;i++)
{
k4=rand(); ///////Õâ¸öFOR±íʾʲôÒâ˼£¬K4Ò²¾ÍÊÇ×îºóÒ»¸öÖµ£¬ÓÐʲô×÷Óã¿
}
k5=(k3+k2)/2; ///////////Õâ¾äÊÇʲôÒâ˼£¿
for(i=0;i<j;i++)
{
num.value=rand();
if(num.fran.first<=33) //////////num.fran.firstÊÇʲôÒâ˼£¿
num.fran.first=num.fran.first+33;
buf[i]=num.fran.first^buf[i]; /* ½øÐÐÒì»ò


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