C語(yǔ)言數(shù)據(jù)結(jié)構(gòu)之動(dòng)態(tài)分配實(shí)現(xiàn)串
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說(shuō)明：堆分配存儲(chǔ)實(shí)現(xiàn)串時(shí)，串并不是以'\0‘， 而是用數(shù)據(jù)項(xiàng)int length來(lái)表示的，所以和傳統(tǒng)的c語(yǔ)言操作字符串有所不同。
頭文件
#ifndef PILEHEAD_H_INCLUDED #define PILEHEAD_H_INCLUDED #include#include typedef struct { char* ch ; int len ; }HString ; int StrAssign( HString* pstr , char* pch ) ; int StrLength( HString* pstr ) ; int StrCompaer( HString* pstr1 , HString* pstr2 ) ; int StrClear( HString* pstr ) ; int StrConcat( HString* pstr , HString str1 , HString str2 ) ; int StrSub( HString* sub , HString pstr , int pos , int length ) ; int StrPrint( HString* pstr ) ; #endif // PILEHEAD_H_INCLUDED
函數(shù)實(shí)現(xiàn)
重慶分公司
重慶分公司
#include "pilehead.h"
int StrAssign( HString* pstr , char* pch )
{
if( !pstr->len )
{
free( pstr->ch ) ;
}
int i ;
for( i = 0 ; pch[i] != '\0' ; i++ )
{
;
}
if( i == 0 )
{
pstr->ch = NULL ;
pstr->len = 0 ;
}
else
{
pstr->ch = ( char* )malloc( i * sizeof( char ) ) ;
pstr->len = i ;
}
i = 0 ;
while( i < pstr->len )
{
pstr->ch[i] = pch[i] ;
i++ ;
}
return 0 ;
}
int StrPrint( HString* pstr )
{
int i = 0 ;
while( i < pstr->len )
{
printf( "%c" , pstr->ch[i] ) ;
i++ ;
}
printf( "\n" ) ;
return 0 ;
}
int StrLength( HString* pstr )
{
return pstr->len ;
}
int StrCompaer( HString* pstr1 , HString* pstr2 )
{
int i = 0 ;
int ret = 0 ;
while( i < pstr1->len && i len )
{
ret = pstr1->ch[i] - pstr2->ch[i] ;
if( ret < 0 )
{
return -1 ;
}
else if( ret > 0 )
{
return 1 ;
}
else
{
i++ ;
}
}
int diff = pstr1->len - pstr2->len ;
if( diff < 0 )
{
return -1 ;
}
else if( diff == 0 )
{
return 0 ;
}
return 1 ;
}
int StrClear( HString* pstr )
{
if( pstr->ch )
{
free( pstr->ch ) ;
pstr->ch = NULL ;
}
pstr->len = 0 ;
return 0 ;
}
int StrConcat( HString* pstr , HString str1 , HString str2 )
{
StrClear( pstr ) ;
StrAssign( pstr , str1.ch ) ;
int len = str1.len ;
int len2 = 0 ;
while( len2 < str2.len )
{
pstr->ch[len++] = str2.ch[len2++] ;
}
pstr->len = str1.len + str2.len ;
return 0 ;
}
int StrSub( HString* sub , HString pstr , int pos , int length )
{
if( pos < 1 || pos > pstr.len || length < 1 || length > pstr.len - pos + 1 )
{
printf( "ERROR!\n" ) ;
exit( 1 ) ;
}
StrClear( sub ) ;
sub->ch = ( char* )malloc( length * sizeof( char ) ) ;
sub->len = length ;
int i = 0 ;
while( i < length )
{
sub->ch[i] = pstr.ch[pos - 1 + i] ;
i++ ;
}
return 0 ;
}
測(cè)試函數(shù)
#include "pilehead.h"
int main()
{
HString str ;
HString str1 ;
HString str2 ;
char* pch = "abcd" ;
StrAssign( &str , pch ) ;
StrAssign( &str1 , "abcd" ) ;
StrAssign( &str2 , "fhasdifhos" ) ;
StrPrint( &str ) ;
StrPrint( &str1 ) ;
/*StrClear( &str ) ;
StrPrint( &str ) ;
int i = StrCompaer( &str , &str1 ) ;
printf( "%d" , i ) ;*/
StrConcat( &str , str1 , str2 ) ;
StrPrint( &str ) ;
HString s ;
StrSub( &s ,str , 4 , 5 ) ;
StrPrint( &s ) ;
return 0;
}
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