/* June 08, 1998 */
/* Program to compute the area of triangle or square */

#include 
#include 

/* function definition */
double area_triangle (double tbase, double theight);
double area_square (double sside);

main ()
{
	/* declarations */
	double side, base, height;
	char type;

	/* Request for type */
	printf("Enter S for Square or T for Triangle> ");
	scanf("%c", &type);
	
	if (type == 'T' || type == 't')
	{
	/* Get input */
	printf("Input the length of the base of the triangle> ");
	scanf("%lf", &base);	
	printf("Input the length of the height of the triangle> ");
	scanf("%lf", &height);

	/* display area of triangle */
	printf("The area of the triangle is %.2f\n", area_triangle(base, height));
	}
	else
	{
	/* Get input */
	printf("Input the length of the side of the square> ");
	scanf("%lf", &side);	
	
	/* display area of square */
	printf("Area of the square is %.2f\n", area_square(side));
	}	
}


/* function definition */

double
area_triangle(double tbase, double theight)
{
	double tarea;
	/* compute area of triangle */	
	tarea = 0.5 * tbase * theight;
	return(tarea);

}

double
area_square(double sside)
{
	/* compute area of square */
	double sarea;
	sarea = sside * sside;
	return(sarea);
}

    Source: geocities.com/yosemite/rapids/9568

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