circle.c

来自「tasking编译器实例开发的自己编写的程序.」· C语言 代码 · 共 18 行

/*	
@(#)m/r/tutor/circle.c	1.7	
*/
/* calculates the area of a circle */
extern double pow(double, double);
float pi = 3.1416;

float circle(radius)
    double radius;
{
    float answer;

	/* pow is a function supplied */
	/* in the C run time library. */
    answer = pi * pow(radius,2.0);
    return(answer);
}