// ConsoleApplication1.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <math.h>




int main()
{
    FILE    *stream, *stream2;


    double output,n,s;
   
   
    errno_t    err;
    err = fopen_s(&stream, "D://input.dat.txt", "r" );
        if(    err    ==    0    )   
        {    printf(    "The    file    myFile.dat    was    opened\n"    );    }
        else   
        { printf(    "The    file    myFile.dat    wasn’t    opened\n"    );    }

        output = fscanf_s(stream, "%lf %lf", &n,&s);
        
        while (output != EOF) {

            printf_s("%f %f\n", n, s);
            output = fscanf_s(stream, "%lf %lf", &n, &s);

            
        }
        
        
        
        
        
            int numclosed = _fcloseall();  
            printf("Number of files closed by _fcloseall:    %u\n", numclosed);
   
        return 0;
}

求自定义函数写出n，s的单独一行的值，进行验证然后取出下一行n,s的值 在进行验证