c - 扫描行中的每个单词或数字并使用 C 打印到文件

Question

我在文件 data1.txt 中有 2 行(如下所示):

Da    KOL    -1.19503   5.27557163                      
MaB   KOL    -1.19503   5.27557163                      

我不确定如何使用 fgets 提取特定的单词或数字，因此我使用 fscanf 扫描集合的每个组件并将它们打印到另一个文件。代码是:

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#include<ctype.h>
#include<math.h>


main()
{
 FILE *fpt1, *fpt2;
    fpt1=fopen("data1.txt","r");
    fpt2=fopen("data2.txt","w");

    int i;
    double  ep, si;
    char *sto1, *sto2;

    for(i=0;i<2;i++)
     {  
       fscanf(fpt1,"%s\n",sto1);
       fscanf(fpt1,"%s\n",sto2);
       fscanf(fpt1,"%lf\n",&ep);
       fscanf(fpt1,"%lf\n",&si);
       fprintf(fpt2,"%s %s %2.8lf %2.8lf\n",sto1,sto2,ep,si);
     }
 fclose(fpt1);
 fclose(fpt2);  
}

但是我在文件 data2.txt 中得到了这个输出:

Da (null) 0.00000000 0.00000000
KOL (null) -1.19503000 5.27557163

虽然，所需的输出是在一行的每个组件之间有一个空格，例如:

Da KOL -1.19503 5.27557163                      
MaB KOL -1.19503 5.27557163     

有人可以帮我解决这个问题吗？

Answer 1

#include <stdio.h>

//A good habit is not to use "main()"
int main(int argc, char *argv[])
{
    FILE *fpt1, *fpt2;
    fpt1=fopen("data1.txt","r");
    fpt2=fopen("data2.txt","w");

    int i;
    double ep, si;
    char sto1[100], sto2[100];  //here neeed array

    for(i=0;i<2;i++)
    {  
        fscanf(fpt1,"%s",sto1); //without '\n'
        fscanf(fpt1,"%s",sto2);
        fscanf(fpt1,"%lf",&ep);
        fscanf(fpt1,"%lf",&si);
        fprintf(fpt2,"%s %s %2.8lf %2.8lf\n",sto1,sto2,ep,si);
    }
    fclose(fpt1);
    fclose(fpt2);       

    return 0;
}