I am having header file named data.h
我有头文件名为data.h
#ifndef data_h
#define data_h
struct Student{
int GPA;
int coursesCount;
float tuitionFees;
};
struct person{
char firstName[11];
char familyName[21];
char telephone[11];
int isStudent;
struct Student student;
};
int maxCount=20;
struct person person[20];
#endif
In student.h I did something like this :
在student.h中,我做了类似这样的事情:
#ifndef __student__
#define __student__
#include <stdio.h>
#include "data.h"
void getStudentData(struct Student);
#endif
In student.c its like this :
在student.c中它是这样的:
#include "student.h"
void getStudentData(struct Student currentStudent){
printf("Hi");
}
I get a Linker error when I ran it through another main.c file. which include all headers.
当我通过另一个main.c文件运行它时,我收到链接器错误。其中包括所有标题。
main.c
main.c中
#include <stdio.h>
#include "student.h"
#include "data.h"
int main(){
getStudentData(person[0].student);
}
What can be reason for this linker error? PLEASE HELP
这个链接器错误的原因是什么?请帮忙
1 个解决方案
#1
2
Declaring variables in header files is generally a bad idea. In your case, you are declaring two variables in your header file:
在头文件中声明变量通常是个坏主意。在您的情况下,您在头文件中声明了两个变量:
int maxCount=20;
struct person person[20];
Let's fix this by declaring them in a *.c
file and creating references to them in the header file.
让我们通过在* .c文件中声明它们并在头文件中创建对它们的引用来解决这个问题。
data.h
#ifndef data_h
#define data_h
struct Student{
int GPA;
int coursesCount;
float tuitionFees;
};
struct person{
char firstName[11];
char familyName[21];
char telephone[11];
int isStudent;
struct Student student;
};
extern int maxCount;
extern struct person person[20];
#endif
student.h
#ifndef student_h
#define student_h
#include <stdio.h>
#include "data.h"
void getStudentData(struct Student);
#endif
data.c
#include "data.h"
int maxcount = 20;
struct person person[20];
student.c
#include "student.h"
void getStudentData(struct Student currentStudent){
printf("Hi");
}
main.c
#include <stdio.h>
#include "data.h"
#include "student.h"
int main(){
getStudentData(person[0].student);
}
#1
2
Declaring variables in header files is generally a bad idea. In your case, you are declaring two variables in your header file:
在头文件中声明变量通常是个坏主意。在您的情况下,您在头文件中声明了两个变量:
int maxCount=20;
struct person person[20];
Let's fix this by declaring them in a *.c
file and creating references to them in the header file.
让我们通过在* .c文件中声明它们并在头文件中创建对它们的引用来解决这个问题。
data.h
#ifndef data_h
#define data_h
struct Student{
int GPA;
int coursesCount;
float tuitionFees;
};
struct person{
char firstName[11];
char familyName[21];
char telephone[11];
int isStudent;
struct Student student;
};
extern int maxCount;
extern struct person person[20];
#endif
student.h
#ifndef student_h
#define student_h
#include <stdio.h>
#include "data.h"
void getStudentData(struct Student);
#endif
data.c
#include "data.h"
int maxcount = 20;
struct person person[20];
student.c
#include "student.h"
void getStudentData(struct Student currentStudent){
printf("Hi");
}
main.c
#include <stdio.h>
#include "data.h"
#include "student.h"
int main(){
getStudentData(person[0].student);
}