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提供一个字符串过滤函数,用这个处理字符串就过了^_^char str[251];
char buf[251];
void filter()
{
int i=0, j=0;
for(; buf[i]!=newl; i++)
{
if( isalpha(buf[i]) )
{
str[j++]=tolower(buf[i]);
}
else if( isdigit(buf[i]) )
{
str[j++]=buf[i];
}
}
str[j]=newl;
}
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