expresn.cpp

C++的常用算法

//这个程序在本书所带软盘中，文件名为EXPRESN.CPP
//这个程序演示各种算术表达式及其运算。

#include <iostream.h>

void main(void)
{
	int penny, nickle, dime, quarter, dollar, cent, total_cent;
	float pi = 3.1415;
	float R, r, area;

	penny = 235;
	nickle = 389;
	dime =  137;
	quarter = 89;
	total_cent = penny + nickle * 5 + dime * 10 + quarter * 25;
	dollar = total_cent / 100;		//计算整数部分
	cent = total_cent % 100;		//计算余数部分

	R = 29.78;
	r = 20.0;
	area = pi * (R*R - r*r);		//圆环面积

	cout << "美元总数：" << dollar << " 元 " << cent << " 美分" << endl;
	cout << "圆环面积：" << area << endl;
}