求解释~~~~ 'strncpy' : is not a member of 'std'

void Stock::acquire(const char * co,int n,double pr)
{
    std::strncpy(company,co,29);
    company[29]='\0';
    if(n<0)
    {
        std::cerr<<"Number of shares can't be negative."
    <<company<<"shares set to 0.\n";
    shares=0;
    }
    else
        shares=n;
    share_val=pr;
    set_tot();
}




K:\stocks\stocks.cpp(22) : error C2039: 'strncpy' : is not a member of 'std'
执行 cl.exe 时出错.

stocks.obj - 1 error(s), 0 warning(s)