再发一贴， 字符串数组的有关问题

再发一贴， 字符串数组的问题~

全部代码
#include   <iostream>
#include   <string.h>
using   namespace   std;

void   main()
{int   year,month,day;
string   week[7]={ "Sunday ", "Monday ", "Tuesday ", "Wednesday ", "Thursday ", "Friday ", "Saturday "};
cout < < "please   enter   year     month     day: " < <endl;

cin> > year> > month> > day;

while(year!=0&&month!=0&&day!=0)
{  


int     total;
int   year_num(int   x);

int   month_num[12]   =   {0,3,3,6,1,4,6,2,5,0,3,5};
if   (((year%4==0&&year%100!=0)||(year%400==0))&&(month> 2))
{
month_num[(month   -   1)]+=1;
}
total=   year_num(year)   +   month_num[(month   -   1)]   +   day;
cout < <week[total%7] < <endl;                  
cout < < "please   enter   year     month     day: " < <endl;
        cin> > year> > month> > day;
}
}
int   year_num(int   x)
{
        int   sum=0,i,j=0;
for(i=1;i <x;i++)
{      
if   ((i%4==0&&i%100!=0)||(i%400==0))
{
sum+=366;
}
                  else    
  {  
  sum+=365;
  }
}
  return   (sum);

}
错误提示如下
  error   C2679:   binary   ' < < '   :   no   operator   defined   which   takes   a   right-hand   operand   of   type   'class   std::basic_string <char,struct   std::char_traits <char> ,class   std::allocator <char>   > '   (or   there   is   no   acceptable   conversion)
Error   executing   cl.exe.



------解决方案--------------------
#include <string.h> 改为 #include <string>