解密程序.cpp

C语言写的加密小程序 支持一下 用代换技术写的

#include<stdio.h>
void main()
{
char fn[30];
unsigned char c1;
int delt;
FILE *fp,*fp1;
printf("input filename:");
scanf("%s",fn);
fp=fopen(fn,"r");
fp1=fopen("source.txt","w");
while(feof(fp)==0)
{
fscanf(fp,"%c",&c1);
if(c1>=32 && c1<=126)
{
delt=126-c1;
c1=32+delt;
}
fprintf(fp1,"%c",c1);
}
::fclose(fp);
::fclose(fp1);
}