//a program to demonstrate functions

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

double func(double x);		/*prototype*/

main()
{
	double z;
	z=func(1.2347);
	printf("z=%0.5f\n",z);

}

double func(double x)		/*definition*/
{
	double y;
	y=pow(sin(x),2) + pow(cos(x),2);
	return y;
}