c中的结构和文件

Question

我有一些问题.我创建了文本文件studenti.txt,内容如下:

1. Gatis Lietnieks 15.06.1993 v
2. Vizma Kalesnica 20.08.1991 s
3. Katrina Sabone 06.12.1992 s
4. Haralds Burkovskis 01.02.1989 v
5. Jezups Martinovs 02.05.1990 v
6. Vizma Zigurde 19.09.1988 s
7. Stasija Balode 12.12.1993 s
8. JānisBērziņš99.03.1992v
9. Zigurds Ritms 16.05.1991 v
10. Pauls Zirdzins 12.11.1989 v
11. Zane Skarbule 28.12.19990 s
12. Aiga Bulle 11.08.1993 s
13. Andrejs Fomkins 11.06.1989 v
14. Maikls Dzordans 08.01.1988 v

我想读取此文件并在c程序中打印文件的内容.我的代码是这样的:

 #include <stdio.h>
 #include <conio.h>
 #include <string.h>
 #include <windows.h>
 #define N 16
 int main()
 {
 FILE *fails_st;

 struct date
 { int da_year;
   int da_month;
   int da_day;
 };

 struct studenti
 {
 int Nr;
 char name[25];
 char surname[25];
 struct date dzd;
 char dzimums[10]; 
 } students[N];

 int i, j;
 system("cls");

 fails_st = fopen("studenti.txt", "r");
 for(i=0; i<N; i++)
 {
 fscanf(fails_st, "%d", students[i].Nr);
 fgets(students[i].name, strlen(students[i].name)+1, fails_st);
 fgets(students[i].surname, strlen(students[i].surname)+1, fails_st);
 fscanf(fails_st, "%d", students[i].dzd.da_day);
 fscanf(fails_st, "%d", students[i].dzd.da_month);
 fscanf(fails_st, "%d", students[i].dzd.da_year);
 fgets(students[i].dzimums, strlen(students[i].dzimums)+1, fails_st);
 }
 fclose(fails_st);
 system("cls");
 printf("Student list\n");
 for(i=0; i<N; i++)
 printf("%4d%15s%15s%d%d%d%%4s\n", students[i].Nr, 
 students[i].name, students[i].surname, 
 students[i].dzd.da_day,students[i].dzd.da_month,students[i].dzd.da_year,students[i].dzimums);
 getch();
 return 0;
 }

但是当我运行程序时,只需停止"myfilename.exe已停止工作..........."我想知道我的代码中的错误在哪里.

Answer 1

请阅读文档fscanf(),您使用错了.您必须传递您希望存储其转换数据的地址fscanf():您希望它如何能够在您的变量中写入？

换句话说,这个:

fscanf(fails_st, "%d", students[i].Nr);

应该:

fscanf(fails_st, "%d", &students[i].Nr);

其中&是C的"地址" - 操作符,它的计算结果是表达式的地址.

另一个问题是你使用strlen()未初始化的字符串,这是无效的.你的意思是:

fgets(students[i].name, sizeof students[i].name, fails_st);

还记得I/O调用可能会失败,你真的应该检查返回值.