#include

#include//颜色

using namespace std;

int jiami();

int jiemi();

int main()

{

printf("**************************************************************\n");

printf("*             凯撒Caesar                                     *\n");

printf("*                                                            *\n");

printf("*             1.加密                                         *\n");

printf("*             2.解密                                         *\n");

printf("*                                     【注】：退出请按0      *\n");

printf("**************************************************************\n");

system("color 40");

int id;

printf("键入操作代号：");

scanf("%d",&id);

switch(id)

{

case 1:

jiami();

break;

case 2:

jiemi();

break;

case 0:

return 0;

default:

main ();

}

return 0;

}

/***********加密*************/

int jiami()

{

int ii=1,kk=2;

printf("[键入完成请输入‘/‘] \n\n");

printf("[明文信息]：\n\n");

char miw[150];

char mingw[100];

for(ii;ii<100;ii++)

{

mingw[ii]=getchar();

if(mingw[ii]<=120&&mingw[ii]>=97)

{

miw[ii]=mingw[ii]+3;

continue;

}

if(mingw[ii]==‘x‘)

{

miw[ii]=‘a‘;

}

if(mingw[ii]==‘y‘)

{

miw[ii]=‘b‘;

}

if(mingw[ii]==‘z‘)

{

miw[ii]=‘c‘;

}

if(mingw[ii]==‘ ‘)

{

miw[ii]=‘ ‘;

}

if(mingw[ii]==‘/‘)

{

printf("[密文信息] \n\n");

break;

}

}

for(kk;kk

{

if(miw[kk]==‘ ‘)

{

printf(" ");

continue;

}

printf("%c",miw[kk]);

}

printf("\n\n");

int id;

printf("键入操作代号：");

scanf("%d",&id);

switch(id)

{

case 1:

jiami();

break;

case 2:

jiemi();

break;

default:

main ();

case 0:

return 0;

}

return 0;

}

/***********解密*************/

int jiemi()

{

int ii=1,kk=1;

printf("[键入完成请输入‘/‘] \n\n");

printf("[密文信息]：\n\n");

char miw[150];

char mingw[100];

for(ii;ii<100;ii++)

{

miw[ii]=getchar();

if(miw[ii]<=123&&miw[ii]>=100)

{

mingw[ii]=miw[ii]-3;

continue;

}

if(miw[ii]==‘a‘)

{

mingw[ii]=‘x‘;

}

if(miw[ii]==‘b‘)

{

mingw[ii]=‘y‘;

}

if(miw[ii]==‘c‘)

{

mingw[ii]=‘z‘;

}

if(miw[ii]==‘ ‘)

{

mingw[ii]=‘ ‘;

}

if(miw[ii]==‘/‘)

{

printf("[明文信息] \n\n");

break;

}

}

for(kk;kk

{

if(mingw[kk]==‘ ‘)

{

printf(" ");

continue;

}

printf("%c",mingw[kk]);

}

printf("\n\n");

int id;

printf("键入操作代号：");

scanf("%d",&id);

switch(id)

{

case 1:

jiami();

break;

case 2:

jiemi();

break;

case 0:

return 0;

default:

main ();

}

return 0;

}