Problem: Write a program that calculates the area and 
perimeter of a right triangle given the length of its base and 
height.

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Problem Analysis

Inputs

	double base   - base of triangle
	double height - height of triangle

Outputs

	double area 
	double perimeter


Additional variable

	double hypotenuse 

Formulas
	area = 1/2  base x height
	perimeter = base + height + hypotenuse
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	hypotenuse = |/  base2 + height2

 

Design

Algorithm

1. Read base and height

2.  Calculate area

3.  Calculate perimeter

4.  Display area and perimeter

Refinement of step 3.
3.1  Calculate hypotenuse
3.2  Add 3 sides to get perimeter


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

int main(void)
{
	double base, height;  /* inputs */
	double perimeter;    /* outputs */
	double area;		/* outputs */
	double hypotenuse;  /* program variable */

	/* Enter base and height */
	printf("Enter base:");
	scanf("%lf", &base);

	printf("Enter height:");
	scanf("%lf", &height);

	/* compute area */
	area = 0.5 * base * height;

	/* compute perimeter */
	hypotenuse = sqrt(pow(base, 2) + pow(height, 2));
	perimeter = base + height + hypotenuse;

	printf("Area is %.2f and perimeter is %.2f", 
		               area,                     perimeter);

	return(0);
}