照着MIRAC说明文档上的内容复制的程序不能link成功，显示：
--------------------Configuration: dddd - Win32 Debug--------------------
Compiling...
dddd.c
Linking...
dddd.obj : error LNK2001: unresolved external symbol _otnum
dddd.obj : error LNK2001: unresolved external symbol _premult
dddd.obj : error LNK2001: unresolved external symbol _mirvar
dddd.obj : error LNK2001: unresolved external symbol _mirsys
Debug/dddd.exe : fatal error LNK1120: 4 unresolved externals
Error executing link.exe.

dddd.exe - 5 error(s), 0 warning(s)

源代码如下：
/*
*   Program to calculate factorials.
*/

#include <stdio.h>
#include <miracl.h>   /* include MIRACL system */

void main()
{ /* calculate factorial of number */
    big nf;                /* declare "big" variable nf */
    int n;
    miracl *mip=mirsys(5000,10);
/* base 10, 5000 digits per big  */
    nf=mirvar(1);   /* initialise big variable nf=1  */
    printf("factorial program\n");
    printf("input number n= \n");
    scanf("%d",&n);
    getchar();
    while (n>1)
        premult(nf,n--,nf); /* nf=n!=n*(n-1)*...2*1  */
    printf("n!= \n");
    otnum(nf,stdout); /* output result */
}

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