[英]Splitting char array into other arrays for using it later and ignoring numbers c++
因此,我需要進行此分配,其中您必須通過給定的重新放置數量來重新定位char數組中的字母。 最后一個字母必須成為第一個。 例如:
輸入:Hello 3輸出:lloHe
但是,如果您有一個句子,則必須對每個單詞分別進行處理,而且,如果有數字,則必須忽略它們。 所以我在處理數字檢查和處理單獨的單詞時遇到麻煩(我使用strtok
拆分它們)。 這是我到目前為止的內容:
#include <iostream>
#include <cstring>
using namespace std;
void Reposition(char text[10000], int n, char result[10000])
{
int startIndex = strlen(text)-1;
int k = n-1;
int currentIndex = 0;
for(int i = 0; i < n; i++)
{
result[k] = text[startIndex];
k--;
startIndex--;
currentIndex++;
}
for(int i = 0; i <= startIndex; i++)
{
result[currentIndex] = text[i];
currentIndex++;
}
}
int main()
{
char text[10000];
cin.getline(text,10000);
int n;
cin >> n;
char result[10000];
char *words;
words = strtok(text, " .,");
while(words != NULL)
{
Reposition(text, n, result);
words = strtok(NULL, " .,");
}
for(unsigned i = 0; i <= strlen(result); i++)
cout << result[i];
return 0;
}
使用std::string
代替C樣式的字符串
要從字符串中刪除數字,請使用<algorithm>
std::remove_if
:
std::string s;
. . .
s.erase(std::remove_if(s.begin(), s.end(), ::isdigit), s.end());
要重新定位字符串中的字符,請使用std::rotate
:
std::rotate(s.begin(), s.begin() + 1, s.end());
我做了功課 不知道您是否熟悉所有這些代碼。 我還重寫了您的重新定位代碼。 看起來很亂。 嘗試從中學習一些東西。
#include <iostream>
#include <cstring>
#include <ctype.h>
using namespace std;
void Reposition(char * text, int len, int n, char * result)
{
int k = n - 1;
for(int i = 0; i < len; i++)
{
result[i] = text[k++];
if(k == len) k = 0;
}
}
int main()
{
char text[10000];
cin.getline(text,10000);
int n;
cin >> n;
char result[10000];
char * word;
char * beginOfWord = text;
char * resultPointer = result;
int wordLen;
while(* beginOfWord)
{
// copy up to somthing from the alphabet
if(!isalpha(* beginOfWord))
{
*resultPointer++ = * beginOfWord++;
continue;
}
// Find the end of this word
word = strpbrk(beginOfWord, " .,0123456789");
if(word != NULL)
{
// len is distance between end of word and begin of word
wordLen = word - beginOfWord;
}
else
{
// Maybe it is the end of the string
wordLen = strlen(beginOfWord);
}
//reposition the word
Reposition(beginOfWord, wordLen, n, resultPointer);
// Move the pointers beyond the word
beginOfWord += wordLen;
resultPointer += wordLen;
}
//Always terminate
*resultPointer ='\x0';
cout << result;
return 0;
}
//reverse will reverse the string starting at position xn and ending at position (yn-1)
void reverse(char *str, int xn, int yn)
{
//positioning the pointers appropriately
char *start = str + xn;
char *end = str + yn - 1;
char temp;
while(start < end)
{
temp = *start;
*start = *end;
*end = temp;
++start;
--end;
}
}
//one of the logic to reposition
void reposition(char *str, int n)
{
int length = strlen(str);
n = (length > n) ? n : (n % length);
reverse(str, 0, n);
reverse(str, n, length);
reverse(str, 0, length);
}
int main()
{
char text[10000];
cin.getline(text,10000);
int n;
cin >> n;
char result[10000];
strcpy(result, text);
cout << "before: " << result << endl;
char *word;
word = strtok(text, " .,");
while(word != NULL)
{
//check if it is not a number
if(isdigit(word[0]) == 0)
{
reposition(word, n);
//find the word postion in text
int word_position = word - text;
//copy the repositioned word in result at its corresponding position.
int i = 0;
while(word[i])
{
result[word_position + i] = word[i];
++i;
}
}
word = strtok(NULL, " .,");
}
cout << "after : " << result << endl;
return 0;
}
輸出:
abcd 345 pqrst 321
3
before: abcd 345 pqrst 321
after : dabc 345 stpqr 321
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