C Programming Language>第六章 [例92]:求圆面积编程。 运行结果: #define pl 3.1415926 area=40.715040 #define s(r) Pl*r*r void minot double a=3. 6. area: area=S(a) printf(area=%ofn", area) 预编 后 void minot double a=3.6. area area=3.1415926aa; printf("area=%f\n", area); US biia( usic duL cng运行结果: area=40.715040