yd1.cpp

加密置换加密方法．能实现加解密的Ｃ程序．

#include<stdio.h>
#define exit
void main()
{FILE *in,*out;
char infile[100],outfile[100];
printf("文件移动课题\n");
printf("输入文件1的名字:\n");
scanf("%s",infile);
printf("输入文件2的名字:\n");
scanf("%s",outfile);
if((in=fopen(infile,"r"))==NULL)
{printf("cannot open infile\n");
exit(0);
}
if((out=fopen(outfile,"w"))==NULL)
{printf("cannot open outfile\n");
exit(0);
}
while(! feof(in))fputc(fgetc(in),out);
fclose(in);
fclose(out);
}