删除所有ascii编码的字符和数字...

#include <cstdlib>
#include <iostream>
using namespace std;
char* filter_ascii(char* str)
{
int oldPtr = 0;
int newPtr = 0;

while(str[oldPtr] != '/0')
{
if(str[oldPtr] > 0x81 || str[oldPtr] == 0x81 && str[oldPtr + 1] >= 0x41)
{
str[newPtr++] = str[oldPtr++];
str[newPtr++] = str[oldPtr++];
}
else if(str[oldPtr] >= '0' && str[oldPtr] <= '9'
|| str[oldPtr] >= 'a' && str[oldPtr] <= 'z'
|| str[oldPtr] >= 'A' && str[oldPtr] <= 'Z')
{
oldPtr++;
}
else
str[newPtr++] = str[oldPtr++];
}
str[newPtr] = '/0';

return str;
}
int main(int argc, char *argv[])
{
char string[] = "fsdfd#$#$#%>?>><?<>?中国&*&()*hJJKHJHK3124324";

cout << filter_ascii(string) << endl;

system("PAUSE");
return EXIT_SUCCESS;
}