1.从控制台输入学员王浩3门课程成绩，编写程序实现
ChengJi
（1）数学课和英语课的分数之差
（2）3门课的平均分
代码如下:
p.p1 { margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px Monaco }
p.p2 { margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px Monaco; min-height: 22.0px }
p.p3 { margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px Monaco; color: #4e9072 }
p.p4 { margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px Monaco; color: #3933ff }
p.p5 { margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px Monaco; color: #7e504f }
span.s1 { color: #931a68 }
span.s2 { color: #7e504f }
span.s3 { color: #000000 }
span.s4 { color: #91afcb }
span.s5 { color: #4e9072 }
span.s6 { text-decoration: underline; color: #7e504f }
span.s7 { color: #0326cc }
span.s8 { color: #3933ff }
span.Apple-tab-span { white-space: pre }
package lianXiTi;
import java.util.Scanner;
public class ChengJi2_5 {
public static void main(String[] args) {
// TODO Auto-generated method stub
/*
* 要求：从控制台输入学院王浩三门课程成绩，编写程序实现：
* 1）数学课和英语课的分数之差
* 2）3门课的平均分
*/
Scanner in=new Scanner(System.in );
System.out.println(" 请输入王浩的语文成绩:");
int chinese=in.nextInt();
System.out.println(" 请输入王浩的数学成绩");
int math=in.nextInt();
System.out.println("请输入王浩的英语成绩");
int english=in.nextInt();
System.out.println("---------------------------------------------------------\n"+"语文\t 数学\t英语\t\n"+chinese+"\t"+math+"\t"+ english+"\n---------------------------------------------------------\n");
int cha=math-english;//数学和英语的成绩差
System.out.println("数学和英语的成绩差是:"+cha);
int average=(chinese+math+english)/3;
System.out.println( "三门课的平均分是:"+average);
}
}
2.已知圆的半径radius= 1.5，求其面积
MianJi
提示：
double pi = 3.14159; // 圆周率
double radius = 1.5; // 半径
double area = pi * radius * radius; // 计算圆面积
代码如下:
p.p1 { margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px Monaco }
p.p2 { margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px Monaco; min-height: 22.0px }
p.p3 { margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px Monaco; color: #931a68 }
p.p4 { margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px Monaco; color: #4e9072 }
p.p5 { margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px Monaco; color: #7e504f }
span.s1 { color: #931a68 }
span.s2 { color: #000000 }
span.s3 { color: #7e504f }
span.s4 { color: #91afcb }
span.s5 { color: #4e9072 }
span.s6 { color: #0326cc }
span.Apple-tab-span { white-space: pre }
package lianXiTi;
public class mianji {
public static void main(String[] args) {
// TODO Auto-generated method stub
/*
* 已知圆的半径 radius=1.5,求其面积,
* 提示:
* double PI=3.14159;
* double=radius=1.5;
* double area=PI*radius*radius;
* 面积为7.068577499999999
*/
double PI=3.14159;
double radius=1.5;
double area=PI*radius*radius;
System.out.println(area);
}
}
3.根据天数（46）计算周数和剩余的天数
提示：
int days = 46; // 天数
int week = days / 7; // 星期
int leftDay = days % 7; // 剩余的天数
代码如下:
p.p1 { margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px Monaco }
p.p2 { margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px Monaco; min-height: 22.0px }
p.p3 { margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px Monaco; color: #4e9072 }
p.p4 { margin: 0.0px 0.0px 0.0px 0.0px; font: 17.0px Monaco; color: #7e504f }
span.s1 { color: #931a68 }
span.s2 { color: #7e504f }
span.s3 { color: #000000 }
span.s4 { color: #91afcb }
span.s5 { color: #4e9072 }
span.s6 { text-decoration: underline }
span.s7 { color: #0326cc }
span.s8 { color: #3933ff }
span.Apple-tab-span { white-space: pre }
package lianXiTi;
public class genJuTianShuJiSuanZhouShu {
public static void main(String[] args) {
// TODO Auto-generated method stub
/*
* 根据天数(46)计算周数和剩余的天数
* 提示: int days=46;
* int week=days/7;
* int leftDay=day%7;
*/
int days=46;
int week=days/7;
int leftDay=days%7;
System.out.println("总共"+days+"周数"+week+" 剩余的天数"+ leftDay);
}
}
4.实现一个数字加密器，加密规则是：加密结果 = （整数*10+5）/2 + 3.14159，加密结果仍为一整数
代码如下:
package pro_0307_01; import java.util.Scanner; public class JiaMi { public static void main(String[] args) { //使用户与控制台进行交互 Scanner in=new Scanner(System.in); System.out.println("请输入一个数:"); //接收从控制台输入的数据,赋值给变量num int num=in.nextInt(); System.out.println("原始数据是:"+num); int num2=(int)((num*10+5)/2+3.14159); System.out.println("加密后的结果是:"+num2); } }
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p.p3 { margin: 0.0px 0.0px 0.0px 0.0px; text-align: justify; font: 10.5px "Trebuchet MS"; color: #000000; min-height: 12.0px }
li.li1 { margin: 0.0px 0.0px 13.0px 0.0px; text-align: justify; font: 16.0px "Times New Roman"; color: #000000 }
span.s1 { }
span.s2 { font: 16.0px "Songti SC" }
span.s3 { }
span.s4 { font: 10.5px "Songti SC" }
ol.ol1 { list-style-type: decimal }
p.p2 { margin: 0.0px 0.0px 0.0px 0.0px; text-align: justify; font: 10.5px "Trebuchet MS"; color: #000000 }
li.li1 { margin: 0.0px 0.0px 13.0px 0.0px; text-align: justify; font: 16.0px "Songti SC"; color: #000000 }
span.s1 { font: 16.0px "Times New Roman" }
span.s2 { }
span.s3 { font: 16.0px "Times New Roman" }
span.s4 { font: 10.5px "Songti SC" }
ol.ol1 { list-style-type: decimal }
li.li1 { margin: 0.0px 0.0px 13.0px 0.0px; text-align: justify; font: 16.0px "Songti SC"; color: #000000 }
span.s1 { font: 16.0px "Times New Roman" }
span.s2 { }
span.s3 { font: 16.0px "Times New Roman" }
ol.ol1 { list-style-type: decimal }