求高手指导C++文件打不开

此程序运行为什么结果总是“结果输出文件打不开！”求高手解答，本人新手，望海涵。
#include<stdio.h>
#include<stdarg.h>
void MyBreak(char * fmt,...)
{
    char buffer[256];
    va_list argptr;
    va_start(argptr,fmt);
    vsprintf(buffer,fmt,argptr);
    va_end(argptr);
#ifdef VC_EXTRALEAN
    AfxMessageBox(buffer);
#else
    printf(buffer);
    getchar();
#endif//VC_EXTRALEAN
}
void PrintM(FILE *fp,double a[],int size,int t,char * fmt,char * title,bool IsLable)
{
    if(title)fprintf(fp,"\n%s:",title);
    int j=0;
    for(int i=0;i<size;i++)
    {
        if(i%t==0)
        {
            j++;
            if(IsLable)fprintf(fp,"\n%3d",j);
            else fprintf(fp,"\n");
        }
        fprintf(fp,fmt,a[i]);
    }
    fprintf(fp,"\n");
}
void main()
{
    double xy[]={1.0,2.0,3.0,4.0,5.0,6.0,7.0,8.0,9.0,10.0};
    FILE *fp;
    fp=fopen("C:\Users\Administrator\Desktop\测量评差程序设计\result.txt","w+");
    if(fp==NULL)
    {
        MyBreak("结果输出文件打不开！");
        return;
    }
    PrintM(fp,xy,10,2,"%8.3lf","坐标",true);
    fclose(fp);
}