Thread: passing struct to function help

Im trying to pass elements of a structure to a function (call by reference)

This code suppose to work like this:
Enter students name and Points
then calculate points to grade in a function.

Code:

#include<stdio.h>


void calculate (struct student *, struct student *);

int main (void)
{
	
	struct student
	{
		char name[30];
		float points;
		int grade;
	}stud[3];

	
	int i;
	for (i=1; i<=3; i++)
	{
		printf("%d.name->", i);  scanf( "%s", &stud[i].name );
		printf("points->");  scanf( "%f", &stud[i].points);
		calculate ( &stud[i], &stud[i] );
	}
	return 0;
}

void calculate ( struct student *nname, struct student *pnt )
{
    int grade;
    grade = ( (*pnt).points < 50 ? 5  :  4-(  (int)(*pnt).points - 50 / 15 )  );
	printf("\n%s´s grade is  %d", (*nname).name, grade);
}

okay, I made some changes to make it more readable
my compiler gives me several errors and warnings
like unknown field etc

Code:

#include<stdio.h>


void calcu (struct student* );

int main (void)
{

	struct student
	{
		char name[30];
		float points;
		int grade;
	}stud[3];


	int i;
	for (i=0; i<3; i++)
	{
		printf("%d.name->", i);  scanf( "%s", &stud[i].name );
		printf("points->");  scanf( "%f", &stud[i].points);
		calcu ( &stud[i] );
	}
	return 0;
}

void calcu ( struct student *ptrstudent )        /* result: 5->"F"  4->"D"  3->"C"  2->"B" 1->"A" */
{
    int result;
	if (ptrstudent->points < 50)
	{
		result=5;
		printf("\n%s failed with a %d in his C test", ptrstudent->name, result);
    }
	else
	{
		result= ( (int)ptrstudent->points - 50 / 15 );
    	printf("\n%s got a %d in his C test", ptrstudent->name, result);
}

THANKS! I changed the code as you said and it works.

Code:

#include<stdio.h>

struct student
	{
		char name[30];
		float points;
		int grade;
	};

void calcu (struct student* );

int main (void)
{

	struct student stud[3];


	int i;
	for (i=0; i<3; i++)
	{
		printf("\n%d.name->", i);  scanf( "%s", &stud[i].name );
		printf("points->");  scanf( "%f", &stud[i].points);
		calcu ( &stud[i] );
	}
	return 0;
}

void calcu ( struct student *ptrstudent )
                                             /* result: 5->"F"  4->"D"  3->"C"  2->"B" 1->"A" */
{
    int result;
	if (ptrstudent->points < 50)
	{
		result=5;
		printf("\n%s failed with a %d in his C test",ptrstudent->name, result);
    }
	else
	{
		result= (4- ( (int)ptrstudent->points - 50 )/ 15 );
    	printf("\n%s got a %d in his C test", ptrstudent->name, result);
    }
}