用半径两端点坐标计算圆的面积代码,C代码库,德仔网

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【C】用半径两端点坐标计算圆的面积

作者:BlueSeaBlueSail / 发布于2013/1/8/ 493

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

/* Calculate the radius and area of circle. */

double distance (double x1, double y1, double x2, double y2)
{
	double dx = x2 - x1;
	double dy = y2 - y1;
	printf ("dx is %f\ndy is %f\n", dx, dy);
	double dsquard = dx * dx + dy * dy;
	printf ("dsquard is %f\n", dsquard);
	double result = sqrt (dsquard);
	return result;
}

double area (double radius)
{
	return 3.1416 * radius * radius;
}

double area_point (double x1, double y1, double x2, double y2)/* To prepare for future use */
{
	return area (distance (x1, y1, x2, y2));
}

int main (void)
{
//	printf ("%f", distance (1.3, 2.4, 7.3, 10.4));
	printf ("Please input both end-points' coordinate of the radius. (x1 y1 x2 y2): "); 
	double a1, b1, a2, b2;
	scanf ("%lf  %lf  %lf  %lf", &a1, &b1, &a2, &b2);
	printf ("x1 = %lf, y1 = %lf, x2 = %lf, y2 = %lf\n", a1, b1, a2, b2);
	double radius = distance (a1, b1, a2, b2);
	double result = area (radius);
	printf ("The area of circle is %lf", result);
	return 0;
}

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　计算圆的面积　

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