#include "C:\borlandc\save\h\all.H"
#include "C:\borlandc\save\h\mouse.H"

int initmouse(int xmi,int xma,int ymi,int yma)    //鼠标器初始函数
{
    int retcode;
    union REGS regs;
    regs.x.ax=0;
    int86(51,&regs,&regs);
    retcode=regs.x.ax;
    if(retcode==0)
    {
        printf("NOT INSTALL MOUSE BGI !!! ");      //返回0值表示鼠标或鼠标驱动程序未安装
        return 0;
    }
    regs.x.ax=7;
    regs.x.cx=xmi;
    regs.x.dx=xma;
    int86(51,&regs,&regs);
    regs.x.ax=8;
    regs.x.cx=ymi;
    regs.x.dx=yma;
    int86(51,&regs,&regs);   //表示鼠标器和驱动程序已安装
    return retcode;
}

int read(int *mx, int *my, int *mbutt)       //获得鼠标的当前位置
{
    int xx0 = *mx;
    int yy0 = *my;
    int but0 = 0, mb, xnew, ynew;

    do
    {
        union REGS regs ;
        regs.x.ax = 3;
        int86(51, &regs, &regs);
        xnew = regs.x.cx;
        ynew = regs.x.dx;
        *mbutt = regs.x.bx;
    }while (xnew==xx0&&ynew==yy0&&*mbutt==but0);
    *mx = xnew;
    *my = ynew;

    return 0 ;
}

void newmouse(int *mx, int *my, int *mbutt)    //把前一位置的鼠标除去，画当前位置的新鼠标
{
    int x0=*mx,y0=*my,x,y,xm,ym;
    read(&xm, &ym, *mbutt);
    drawmouse(x0,y0);
    drawmouse(xm,ym);

    *mx = xm;    //将鼠标的当前位置作为下一新鼠标的前一位置
    *my = ym;
}

void drawmouse(int x,int y)    // 画出鼠标
{
    setwritemode(XOR_PUT);//异或
    setlinestyle(0,0,1);
    setcolor(RED);
    line(x,y,x+11,y+11);
    line(x+10,y+11,x+8,y+11);
    line(x+7,y+11,x+10,y+19);
    line(x+9,y+20,x+8,y+20);
    line(x+7,y+19,x+4,y+12);
    line(x+3,y+13,x+1,y+15);
    line(x,y+16,x,y+1);
    setcolor(DARKGRAY);
    line(x+1,y+2,x+1,y+14);
    line(x+2,y+3,x+2,y+13);
    line(x+3,y+4,x+3,y+12);
    line(x+4,y+5,x+4,y+11);
    line(x+5,y+6,x+5,y+13);
    line(x+6,y+7,x+6,y+15);
    line(x+7,y+8,x+7,y+10);
    line(x+7,y+14,x+7,y+17);
    line(x+8,y+9,x+8,y+10);
    line(x+8,y+16,x+8,y+19);
    line(x+9,y+10,x+9,y+10);
    line(x+9,y+18,x+9,y+19);
    setwritemode(COPY_PUT);//复制
}

头文件换一下就行了
求正确答案啊

换头文件就行了，那就是说库函数不对了