#include <stdio.h>
#include <math.h>

double calc(double x);


int main(void)
{
        /*Declaration of variables*/
        double  input,
                output;

        /*Print user interface*/
        printf("Enter a number x: ");

        /*Scan for user input*/
        scanf("%lf", input);

        /*Call to calculating function*/
        calc(input);

        /*Print the calculated value*/
        printf("f(x) = %f\n", input );

        /*Return value to operating system*/
        return 0;
}

double calc(double x)
{
        /*Function*/
        if ( ( ( x * x ) - ( 5 * x ) + 6 ) != 0 && ( ( 3 * x ) + 6 ) > 0 )
        {
                return ( ( 1 + ( ( x * x ) / ( sqrt( ( 3 * x ) + 6 ) ) ) ) / ( ( x * x) - ( 5 * x ) + ( 6 ) ) );
        }
        else
        {
                printf("f(x) is not defined\n");
        }
}