矩阵输出无结果

为什么程序运行总是：按任意键继续

#include<stdarg.h>
#include<stdio.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 m[][3],int n,char *fmt,char *title,bool IsLable)
{
    if(title)fprintf(fp,"\n%s:",title);
    for(int i=0;i<n;i++)
    {
        if(IsLable)fprintf(fp,"\n%3d",i+1);else fprintf(fp,"\n ");
        for(int j=0;j<=i;j++) fprintf(fp,"%f",m[i][j]);
    }
}
void main()
{
    double a[][3]={{1.0,0.0,-1.0},{0.0,2.0,4.0},{-1.0,4.0,5.0}};
    FILE *fp=fopen("2.txt","r");
    if(fp==NULL)
    {
        MyBreak("结果输出文件打不开!");
        return;
    }
    printm(fp,a,3,"%8.3lf","a矩阵",true);
    fclose(fp);
}