Thread: string undeclared ?

Code:

I have got some truble,like these:

dream@liuguobiao:~/Desktop$ cat c.c
#include <stdio.h>
#include <string.h>

int main()
{
        string st;
        st = Getline();
        return 0;
}
dream@liuguobiao:~/Desktop$ gcc -o c c.c
c.c: In function 'main':
c.c:6: error: 'string' undeclared (first use in this function)
c.c:6: error: (Each undeclared identifier is reported only once
c.c:6: error: for each function it appears in.)
c.c:6: error: expected ';' before 'st'
c.c:7: error: 'st' undeclared (first use in this function)
dream@liuguobiao:~/Desktop$ 

why it said "string undeclared" ?
 I can find "string.h"  in  "/usr/include" 
 but why i can't use 'string' declared the 'st'  ?
 help me ......