1ii.cpp

来自「C/C++程序设计导论（第二版）》程序源文件」· C++ 代码 · 共 10 行

// Calculate the area of a circle given a radius value
#include <iostream.h>
void main()
{	float area, radius;	
	cout << "enter a radius: ";
	cin >> radius;
	area = radius * radius * 3.14;
	cout << "the area is " << area << endl;
}