我在使用 Vigenere 时遇到了一些问题,需要一些帮助。
/*
This program is a Vigenere Cipher.
I am Daniel of Asguard.
*/
#include <cs50.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, string argv[])
{
string cipher; //this is a placeholder for the ciphered message.
char * key = argv[1];
int i = 0;
if (argc != 2) //this is meant to trigger if you don't enter the right call. So
{
printf("Please enter the cipher key when you call the program, such as './CaesarCipher 7'.\n"); //
return 1;
}
if (!isalpha(key[i])) //this is meant to trigger if you don't enter the right call. So
{
printf("Please only enter a word, no numerical numbers please."); //
return 1;
}
do
{
//printf("Please enter the message you would like to have converted, please. \n");
cipher = GetString();
}
while (cipher == NULL);
for (int i = 0, k = 0, n = strlen(cipher); i < n; i++, k++) //this is so the code knows to change only the characters in the sting cipher.
{
if (k >= strlen(key))
{
k = 0;
}
{
if (isupper(cipher[i]))
{
//cipher[i] = 'A' + (((cipher[i] - 'A') + (key[k]) - 'A') % 26);
cipher[i] = ((key[k] - 65) + (cipher[i] - 65)) % 26;
printf("%s\n", cipher);
}
else (islower(cipher[i]));
{
//cipher[i] = 'a' + (((cipher[i] - 'a') + (key[i]) - 'a') % 26);
cipher[i] = ((key[k] - 97) + (cipher[i] - 97)) % 26;
printf("%s\n", cipher);
}
}
}
printf("%s\n", cipher);
return 0;
}
当我这样做时,我的结果会出现奇怪的字符:⎽c▒⎺e┼├⎼▒┤└e⎼@☃de5▮:·/┬⎺⎼┐⎽⎻▒ce/⎻⎽e├2 $ └▒ ┐e ┴☃±e┼e⎼e 代表完成后我终端中的所有字母。
对于 BaZ,我的结果最终如下所示:
- 任何值得注意的事情
- 有什么值得注意的
- 注意事项
- 注意事项
- 注意事项
- 注释
- 注释
- 值得注意
- 值得注意
- 值得注意
- f 注意
- f 注意
- 注意
- 注意
- 注意
- 注意
- ├e
- e
最佳答案
下面的代码按照 https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher 中的示例按预期工作
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main (void)
{
const char *cipher = "ATTACKATDAWN";
const char *key = "LEMON";
char *newkey;
char *p, *q;
int i =0;
int col, row;
if (strlen (key) < strlen (cipher))
{
printf ("key %s \n", key);
printf ("cipher \t%s \n", cipher);
newkey = malloc ( strlen (cipher) +1);
strcpy ( newkey, key);
p = (char *) (newkey + strlen (newkey)) ;
q = (char *) key;
i =strlen (key);
while (i < strlen (cipher) )
{
i++;
if (*q == 0)
q = (char *) key;
*p = *q;
p++;
q++;
}
*p = 0;
printf ("newk \t%s \n", newkey);
}
p = (char *) newkey;
q= (char *) cipher;
int a[1] ;
a[1] =0;
for (i =0 ; i < strlen(newkey); i++)
{
row = *p -65;
col = *q -65;
if (col+row > 26)
a [0] = 65 + col+row -26;
else
a [0] = 65 +col+row;
printf ("%s",(char *) &a[0]);
p++;
q++;
}
printf ("\n");
free( newkey);
/*L X F O P V E F R N H R*/
return 0;
}
关于CS50 Vigenere - 奇怪的图案,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33459917/