[英]stuck with the vigenere.c
I am stuck in this example.
我陷入了这个例子。 Whenever I put the keyword 'bacon' I get the wrong answer.
每当我输入关键字“培根”时,我都会得到错误的答案。 Any idea why this is happening?
知道为什么会这样吗? I can't find the bug and I have tried a lot.
我找不到错误,并且尝试了很多。 Can you please help me?
你能帮我么?
When I run this: ./vigenere bacon
and input the text Meet me at the park at eleven am
the answer should be Negh zf av huf pcfx bt gzrwep oz
, but instead I get Negh ne og tjs qaty bt syfvgb bm
当我运行此命令时:
./vigenere bacon
,输入文字Meet me at the park at eleven am
,答案应该是Negh zf av huf pcfx bt gzrwep oz
,但我却得到了Negh ne og tjs qaty bt syfvgb bm
Update: I made some changes as suggested by the comments but still having the same problem.
更新:我根据评论的建议进行了一些更改,但仍然存在相同的问题。
#include<cs50.h>
#include<ctype.h>
#include<stdio.h>
#include<string.h>
int main(int argc, char *argv[])
{
//check if it has only two values
if (argc != 2)
{
printf("Usage: ./vigenere keyword\n");
return 1;
}
// check that every letter of keyword is alphabetic
char *keyword = argv[1];
int keylen = strlen(keyword);
for (int i = 0, n = keylen; i < n; i++)
{
if(!isalpha(keyword[i]))
{
printf("alphabetic keyword only!!!\n");
return 1;
}
if(isalpha(keyword[i]))
{
// if a letter of keyword is uppercase
if (isupper(keyword[i]))
{
keyword[i] = keyword[i] - 'A';
}
// if a letter of keyword is lowercase
if (islower(keyword[i]))
{
keyword[i] = keyword[i] - 'a';
}
}
}
char *text = GetString();
for (int i = 0, n = strlen(text); i < n; i++)
{
if (isalpha(text[i]))
{
// if plaintext letter uppercase then...
if (isupper(text[i]))
{
text[i] = ((text[i] - 'A') + (keyword[i % keylen])) % 26 + 'A';
printf("%c",text[i]);
// ^^^^^^ ----> repeat the pattern
}
// if plaintext letter lowercase then ...
if (islower(text[i]))
{
text[i] = ((text[i] - 'a') + (keyword[i % keylen])) % 26 + 'a';
printf("%c",text[i]);
}
}
// if no letters in plaintext then ...
if (!isalpha(text[i]))
{
text[i] = text[i];
printf("%c",text[i]);
}
}
printf("\n");
}
So as @BLUEPIXY suggested I had to use a different variable in order to get the right answer:
因此,如@BLUEPIXY所建议,我必须使用其他变量才能获得正确的答案:
`char *text = GetString();
int k = 0;
for (int i = 0, n = strlen(text); i < n; i++)
{
if (isalpha(text[i]))
{
// if plaintext letter uppercase
if (isupper(text[i]))
{
text[i]= ((text[i] - 'A') + (keyword[k % keylen])) % 26 + 'A';
printf("%c",text[i]);
//^^^^^ ----> repeat the keyword pattern
}
// if plaintext letter lowercase
if (islower(text[i]))
{
text[i] = ((text[i] - 'a') + (keyword[k % keylen])) % 26 + 'a';
printf("%c",text[i]);
}
k++;
}`
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