C 程序 fscanf 跳过行

Question

这个程序需要一个文件，并且应该将文件内容传输到一个结构

文件内容为：

11.0,  11.0, 11.0,  14.0
22.4,  22.4, 22.4,  28.9
12.7,  13.8, 14.6,  14.5
23.5,  13.5, 42.5,  21.8
18.0,  16.0, 21.0,  42.9
21.0,  21.0, 21.0,  100.0

文件的输出是：

22.4,  22.4, 22.4, 28.9
23.5,  13.5, 42.5, 21.8
21.0,  21.0, 21.0, 100.0

它正在跳过文件内容中的每一行，我不确定如何解决这个问题。

#include <stdio.h>

#define MAX_ITEMS 100

struct item {
    double item1;
    double item2;
    double item3;
    double item4;
};

int main(void)
{
    struct item myItems[MAX_ITEMS]; 
    int i = 0;

    FILE *input;
    input = fopen("items.txt", "r");

    if(input == NULL) {
        printf("Error opening file\n");
        return 1;
    }

    while(fscanf(input, " %lf,%lf,%lf,%lf", &myItems[i].item1,&myItems[i].item2,   
             &myItems[i].item3, &myItems[i].item4) == 4) 
    {
       fscanf(input, " %lf,%lf,%lf,%lf", &myItems[i].item1,&myItems[i].item2,    
             &myItems[i].item3, &myItems[i].item4);
       printf("%lf %lf %lf %lf\n", myItems[i].item1, myItems[i].item2,     
             myItems[i].item3, myItems[i].item4);
       i++;
    }

  fclose(input);
  return 0;
}

Answer 1

问题的发生是因为你调用了两次fscanf并且只打印了后者的结果。你你反而这样做

while(fscanf(input, " %lf,%lf,%lf,%lf", &myItems[i].item1,&myItems[i].item2,   
             &myItems[i].item3, &myItems[i].item4) == 4) {
     printf("%lf %lf %lf %lf\n", myItems[i].item1, myItems[i].item2,     
             myItems[i].item3, myItems[i].item4);
    i++;
}

C 程序 fscanf 跳过行

C Program fscanf skips lines

c

file-io

struct

scanf