C语言实现读取excel数据处理后生成txt文件

#include <stdio.h>
#include <malloc.h>
void  main()
{
   
      remove("D:\\newtest.txt");
    FILE *fp;
    FILE *nw = NULL ;
    nw = fopen("D:\\newtest.txt","w") ;
    char filename[40]  ;
    int i,j ;
      int m, n;
      n=3;
      printf("请输入行数:");
      scanf("%d", &m);
      float** da = (float**)malloc(s