#include "stdio.h"
#include "gsl_matrix.h"

int print_half_00(gsl_matrix* m)
{
	double half = 1/2;
	int *status = printf( "half m_{00} = %i\n", gsl_matrix_get(&m,0,0)*half );
	gsl_matrix_free(m);
	return status;
}

int main(void)
{
	gsl_matrix m = gsl_matrix_alloc(0,0);
	gsl_matrix_set(&m,0,0,66);
	printf("half m_{00} (should be 33):\n");
	int *status = print_half_00(&m);
	if(status>0)
		printf("status=%g : SOMETHING WENT TERRIBLY WRONG (status>0)\n",*status);
	else
		printf("status=%g : everything went just fine (status=0)\n",*status);
	gsl_matrix_free(&m);
return 0;
}