我正在尝试从我的字符*中删除不必要的空格以备将来使用。基本上,我只想在单词之间有一个空格,并删除单词之间的任何其他空格、制表符或换行符。我相信我当前的代码几乎可以工作,但我无法读取我存储在数组中的单个字符的内存。此外,任何解决方案都不得具有最大字符大小,因此如果需要动态内存分配,也需要考虑。有没有办法让它工作?谢谢
编辑1:还应删除尾随和前导空格。感谢莫斯科@Vlad的澄清
int main()
{
char* fileString1;
fileString1=removeAdditionalWhiteSpace(fileString1);
}
char* removeAdditionalWhiteSpace(char* wordList)
{
char characterHolder;
char* finalList[strlen(wordList)];
char* delimeter = wordList;
int i = 0;
do
{
finalList[i] += characterHolder;
char* hasSpace = NULL;
while (*delimeter == ' ' || *delimeter == 'n' || *delimeter == 't')
{
if(*delimeter == ' ')
{
if(hasSpace==NULL)
{
hasSpace = delimeter;
characterHolder = *delimeter;
}
else
{
++delimeter;
}
}
else if(*delimeter == 'n' || *delimeter == 't')
{
*delimeter = ' ';
if(hasSpace==NULL)
{
hasSpace = delimeter;
characterHolder = *delimeter;
}
else
{
++delimeter;
}
}
}
hasSpace=NULL;
characterHolder = *delimeter;
i++;
}
while( (*wordList++ = *delimeter++) );
return *finalList;
}
您的函数没有意义并且具有未定义的行为。
例如,变量characterHolder
未初始化,它被添加到指针finalList[i]
char characterHolder; // <===
char* finalList[strlen(wordList)];
char* delimeter = wordList;
int i = 0;
do
{
finalList[i] += characterHolder; // <===
//….
如果您需要从字符串中删除多余的空格,包括其前导空格和尾随空格,则该函数可以看起来像下面的演示程序所示。
#include <stdio.h>
#include <ctype.h>
char * remove_duplicate_spaces( char *s )
{
char *src = s, *dsn = s;
while ( isspace( ( unsigned char )*src ) ) ++src;
do
{
char c = *src;
if ( isspace( ( unsigned char )c ) ) c = ' ';
if ( c == ' ' )
{
while ( isspace( ( unsigned char ) *++src ) );
if ( *src )
{
*dsn++ = c;
}
}
*dsn++ = *src;
} while ( *src++ );
return s;
}
int main(void)
{
char s[] = "ttIt istta verynlongnstring.tt";
printf( ""%s"n", s );
printf( ""%s"n", remove_duplicate_spaces( s ) );
return 0;
}
它的输出是
" It is a very
long
string. "
"It is a very long string."
看起来超级复杂的人。
下面是一个从字符串中删除空格的简单函数:" This is a test t of some n Extra white space. "
#include <stdio.h>
#include <ctype.h>
void removeWS(char* text)
{
char* d = text;
while (isspace(*text)) ++text;
while(*text)
{
*d = isspace(*text)? ' ' : *text;
text++;
while (isspace(*d) && isspace(*text)) ++text;
if (*text) d++;
}
*d = *text;
}
int main(void) {
char text[] = " This is a test t of some n Extra white space. ";
removeWS(text);
printf("%sn", text);
return 0;
}
示例输出:
Success #stdin #stdout 0s 4284KB
This is a test of some Extra white space.
简约方法:
size_t delspaces(char * str)
{
size_t src, dst;
size_t cnt;
for (cnt=src=dst=0; str[dst] = str[src++]; ) {
if (isspace(str[dst])) {
if (dst && !cnt++) str[dst++] = ' '
continue;
}
cnt=0;
dst++;
}
// remove trailing spaces
while (dst && isspace(str[dst-1])) str[--dst] = 0;
// return the string length of the resulting string
// (which could be useful for the caller)
return dst;
}
最后注意:最后while()
可能是一个if()
,因为只能有一个尾迹空间。