trouble with structure

I'am just starting with programming a code with structure. I need some input on the bottom four lines of codes., why wouldn't it read in the values. Seems to work fine, up to that point.

Code:

#include <stdio.h>

#define grade_test 3

struct graderecord
{
	char name[21];			
	char id_num[12];
	float test[grade_test];
	float final;
	float homework;
	float total;
};


void read_in_students(struct graderecord *std_ptr);

int main(void)
{
	struct graderecord grades;

	read_in_students(&grades);
}

void read_in_students(struct graderecord *std_ptr)
{
	int i,j,num_students;

	printf("Number of students in class:");
	scanf("%d",&num_students);

	/* Input information about students */
	for (i = 0; i < num_students; i++)
	{
		printf("Enter student name #%d: ", i+1);
		scanf("%s", std_ptr->name);

		printf("Enter student id number: ");
		scanf("%d",std_ptr->id_num);
		
		for (j = 0; j < grade_test; j++)
		{
			printf("Enter score on test #%d: ", j+1);
			scanf("%f", std_ptr->test);
		}
	
		printf("Enter homework score; ");
		scanf("%f", &graderecord.homework);
		
		printf("Enter the final exam score: ");
		scanf("%f",&grade.final);
		
	}	
	
}

Make sure you use the correct directives and arguments with scanf. For example,

Code:

scanf("%d",std_ptr->id_num);

std_ptr->id_num is not an int.

[edit]

Code:

scanf("%f", &graderecord.homework);

Code:

scanf("%f",&grade.final);

Know your variable names and types.

[edit=2]

Code:

void read_in_students(struct graderecord *std_ptr)
{
	int i,j,num_students;

	printf("Number of students in class:");
	scanf("%d",&num_students);

	/* Input information about students */
	for (i = 0; i < num_students; i++)
	{
		printf("Enter student name #%d: ", i+1);
		scanf("%20s", std_ptr->name);

		printf("Enter student id number: ");
		scanf("%11s",std_ptr->id_num);
		
		for (j = 0; j < grade_test; j++)
		{
			printf("Enter score on test #%d: ", j+1);
			scanf("%f", &std_ptr->test[j]);
		}
	
		printf("Enter homework score; ");
		scanf("%f", &std_ptr->homework);
		
		printf("Enter the final exam score: ");
		scanf("%f",&std_ptr->final);
	}	
}

[edit=last call]And note that you are reading all of these records into a single record.

Hi,

the Error must be coming in your program is

"Floating points format not linked. abnormal program termination."
the reson for this error is....

Some compilers for small machines, including Turbo C (and Ritchie's original PDP-11 compiler), leave out certain floating point support if it looks like it will not be needed. In particular, the non-floating-point versions of printf and scanf save space by not including code to handle %e, %f, and %g. It happens that Borland's heuristics for determining whether the program uses floating point are insufficient, and the programmer must sometimes insert a dummy call to a floating-point library function (such as sqrt; any will do) to force loading of floating-point support.

A partially-related problem, resulting in a similar error message (perhaps ``floating point not loaded'') can apparently occur under some MS-DOS compilers when an incorrect variant of the floating-point library is linked. Check your compiler manual's description of the various floating-point libraries.

Hi,

the Error must be coming in your program is

"Floating points format not linked. abnormal program termination."

That's your error. I imagine that if the OP fixed what Dave_Sinkula noted it might work properly.