[算法练习]将字符串中*提前&&删除指定字符
//思路：只要不是星号的都交给写指针写入,忽略*//问题可以转换为：删除字符串中的特定字符 只不过这个是从尾巴开始
#include <stdio.h>
size_t _strlen(char *str)
{
return (NULL == str || *str =='\0') ? 0 : _strlen(str+1) + 1;
}
//思路：只要不是星号的都交给写指针写入,忽略*
//问题可以转换为：删除字符串中的特定字符 只不过这个是从尾巴开始
char* str_TiQian(char *str)
{
if(NULL == str || *str == '\0')
return NULL;
int len = 0;
int Dst = 0;
int count = 0;
len = Dst = _strlen(str) - 1;
do
{
if(str != '*')
str = str;//这里是先执行str = str 然后才dst-1;
else
count ++;
} while (len--);
for (int i = 0; i < count; i++)
{
str = '*';
}
printf("%s\n",str);
return str;
}
//思路同上
char* str_TiQian_Ex(char* str)
{
if(NULL == str || '\0' == *str)
return NULL;
char *pRead = 0;
char *pWrite = 0;
pRead = pWrite = str + _strlen(str) - 1;
do
{
if(*pRead != '*')
*pWrite-- = *pRead;
} while (pRead-- != str);//先比较再赋值
while (pRead <= pWrite)
{
*pRead++ = '*';//先执行后面的在执行加操作
//相当于
//*pRead = '0';
//pRead ++;
}
printf("%s\n",str);
return str;
}
char* Del_speciol_ch(char *str, char ch)
{
if(NULL == str || *str == '\0')
return NULL;
char *pRead = 0;
char *pWrite = 0;
pRead = pWrite = str;
do
{
if(*pRead != ch)
*pWrite++ = *pRead;
} while (*pRead++ != '\0');
printf("%s\n",str);
return str;
}
char* Del_speciol_ch_Ex(char *str, char ch)
{
if(NULL == str || *str == '\0')
return NULL;
int sour = 0;
int dst = 0;
do
{
if(str != ch)
str = str;
} while (str != '\0');
printf("%s\n",str);
return str;
}
void main()
{
char str0 = "hel*lo w*or*ld";
printf("%s\n",str0);
str_TiQian(str0);
char str1 = "***hel*l**o w*o**r*ld**";
printf("\n%s\n",str1);
str_TiQian(str1);
char str3 = "***hel*l**o w*o**r*ld**";
printf("\n%s\n",str3);
str_TiQian_Ex(str3);
char str4 = "hel***lo w*or*ld";
printf("\n%s\n",str4);
str_TiQian_Ex(str4);
printf("\n----------\nDel * \n");
char str5 = "hel***lo w*or*ld";
printf("\n%s\n",str5);
Del_speciol_ch(str5,'*');
Del_speciol_ch(str3,'*');
char str6 = "hel***lo w*or*ld";
char str7 = "***hel*l**o w*o**r*ld**";
printf("\n%s\n",str6);
Del_speciol_ch_Ex(str6,'*');
printf("\n%s\n",str7);
Del_speciol_ch_Ex(str7,'*');
getchar();
}
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