我回去给你搞搞  我现在这里没VC

#include<stdio.h>
#define N 100
typedef struct student
{
    char a[10];
    float d;
    float b;
    float c;
}stu;



void add(stu *s)
{
    stu *p;
     int i;
   
    FILE *fp;
    p=s;

    if((fp=fopen("f:\\read.txt","a+"))==NULL)
    {
        printf("cannot open the file!\n");
        return;
    }
    for(i=0;i<N;i++)
        if(fwrite(p,sizeof(struct student),1,fp)!=1)
            printf("file write error!\n");
        rewind(fp);
        fclose(fp);
        
}
void shuchu(stu *s)
{


    FILE *fp;
    int i;
    fp=fopen("f:\\read.txt","r");
    while(1)
    {
        fread(s,sizeof(struct student),1,fp);
        printf("%-s   %-f   %-f   %-f \n",s->a,s->d,s->b,s->c);
        if (feof(fp))
        {
            break;
        }
    }

    fclose(fp);
   
}
void main()
{
       stu s;
       int i;
       printf("请输入数据:\n");

       for(i=0;i<N;i++)
       scanf("%s %f %f %f",s.a,&(s.d),&(s.b),&(s.c));
       add(&s);
       shuchu(&s);
}
   这个你试试

简单的读一下文件 和写一下文件 ，看看行不？

#include "stdafx.h"
#include <iostream>
using namespace std;

int main(int argc, char* argv[])
{
    FILE *fp,*fw;
    fp = fopen("read.txt","r");
    fw = fopen("write.txt","w");
    if(fp != NULL)
    {
        char buffer[100];
        char bufferw[100];
        while(fgets(buffer,sizeof(buffer),fp) != NULL)
        {
            strcpy(bufferw,"atom");
            char *token = strtok(buffer," "); 
            while(token != NULL)
            {
                token = strtok(NULL," ");
                if(token !=NULL)
                {  
                    strcat(bufferw,"  ");
                    strcat(bufferw,token);
                }
            }
            printf("%s",bufferw);
            fputs(bufferw,fw);
        }
    }
    fclose(fp);
    fclose(fw);
    return 0;
}

 

[ 本帖最后由 pbreak 于 2010-7-2 09:33 编辑 ]

大家帮我看看、哪儿错了啊？
#include<stdio.h>

main()
{
 int i;
 char string[142][4];
 float a[142],b[142],c[142];
 FILE *fp;
 if((fp=fopen("final.txt","r"))!=0)
  {
    for(i=0;i<142;i++)
   
     {fscanf(fp,"   %c    %f  %f  %f",string[i],a,b,c);
    }
   
  
  fprintf(fp,"%c %f %f %f\n",string[i],a,b,c);
  
  
  }

fclose(fp);
fp=fopen("final.bs","w");
for(i=0;i<142;i++)

{

fprintf(fp,"%c %f %f %f\n",string[i],a,b,c);


fprintf(fp,"%c %f %f %f\n",string[i],a,b,c);

}
fprintf(fp,"\n\nspec C 0.300 0.100 0.100 0.500\n");

fprintf(fp,"\n\nspec H 0.200 0.100 0.500 0.500\n");

fprintf(fp,"bonds C C 0.000 1.500 0.0400 1.0 0.0 1.0\n");
fprintf(fp,"bonds H C 0.000 1.500 0.0400 1.0 0.0 1.0\n");
fprintf(fp,"\nscale 20\ninc 1.000");
fclose(fp);

}

#include<stdio.h>

main()
{
    int i;
    char string[142][5];
    float a[142],b[142],c[142];
    FILE *fp;
    if((fp=fopen("D:/final.txt","r"))!=0)
    {
        for(i=0;i<142;i++)
        {
            fscanf(fp,"%c%c%c%c%c        %f   %f    %f ",&string[i][0],&string[i][1],&string[i][2],&string[i][3],&string[i][4],&a[i],&b[i],&c[i]);
        }          
    }
   
    if(fp)
        fclose(fp);
       
    fp=fopen("D:/final3.txt","w");
    for(i=0;i<142;i++)
    {
        int j=0;
        for(j=0;j<5;j++)
        {
            if(string[i][j]=='.')
                break;
        }
        fprintf(fp,"atom %c %12f %12f %12f\n",string[i][j+1],a[i],b[i],c[i]);
    }
}