#include <stdio.h>
#include <stdlib.h>
int main()
{
FILE *fp, *fp2;
char old[16], enc[16], dec[16];
int num;
printf("passwd:");
scanf("%s",old);
for(num=0;old[num];num++)
enc[num] = old[num] + 1;
enc[num] = '\0';
fp=fopen("fp.txt","w");
fprintf(fp,"%s",enc);
fclose(fp);
fp2=fopen("fp2.txt","w");
for(num=0;old[num];num++)
dec[num] = enc[num] - 1;
dec[num] = '\0';
fprintf(fp2,"%s",dec);
fclose(fp2);
system("pause");
return 0;
}
for(num=0;old[num];num++)
old[num]
是什么意思
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