header file creating in c language

[gopalverma]

first i create a header file name is sample.h
and write with in it

int sum(int x,int y);
float average(float x,float y,float z);
 

.................................................. ......
after that i create a file name is sample.c
in which i write..

int sum(int x,int y)
{
return(x+y);
}
float average(float x,float y,float z)
{
return((x+y+z)/3);
}
 

................................................
after that i write a file name is example.c
in which i write

#include<stdio.h>
#include"sample.h"
main(){
int thesum=sum(10,10);
float theaverage=average(2.3,5.7,88,5);
printf("%i",thesum);
printf("%f",theaverage);
getch();
return 0;
}
 

?///////////////////////////////////////
but after complitation.......
error message are>>>>>>>>
undefined symbol sum in module sample.c
undefined symbol average in module sample.c
..................................
plz help me

[Banfa]

Have you included sample.h in sample.c

[kreagan]

Though I don't think this will solve your problem, line 5 in example.c has too many parameters.

You have

float theaverage=average(2.3,5.7,88,5);  //Four parameters

It should be

float theaverage = average(2.3,5.7,88.5) //three parameters

I don't see anything else wrong syntax wise. You might want to make sure the sample.h file is in your class path. Example.c might not "see" sample.h. Are all these files in the same folder? What IDE (if you are using any) are you using?