Exam2003

1.输入球的中心点和球上某一点的坐标，计算球半径和体积。

C++

#include <iostream>
#include <cmath>
using namespace std;

double const PI=3.14;
int main()
{
	double a,b,c,x,y,z,r,v;
	cout<<"input circle center coordinates:";
	cin>>a>>b>>c;
	cout<<"input coordinates of any point:";
	cin>>x>>y>>z;
	r=sqrt(pow(x-a,2)+pow(y-b,2)+pow(z-c,2));
	v=4/3.0*PI*pow(r,3);		//注意：4/3=1,所以要除以 3.0 
	cout<<"Radius is:"<<r<<endl;
	cout<<"Volume is:"<<v<<endl;
	return 0;
}

package exam2003

import (
	"fmt"
	"math"
)

//Sphere is used to calculate the radius and volume of a certain sphere
func Sphere() {
	var a, b, c, x, y, z, r, v float64
	fmt.Print("input the circle center coordinates:")
	fmt.Scan(&a, &b, &c)
	fmt.Print("input the coordinates of any point:")
	fmt.Scan(&x, &y, &z)
	r = math.Sqrt(math.Pow(x-a, 2) + math.Pow(y-b, 2) + math.Pow(z-c, 2))
	v = 4 / 3.0 * math.Pi * math.Pow(r, 3)
	fmt.Printf("The radius is:%f\n", r)
	fmt.Printf("The volume is:%f\n", v)

}

2.手工建立一个文件，文件种每行包括学号、姓名、性别和年龄。每一个属性使用空格分开。再根据输入的学号，查找文件，输出该学生的信息。文件如下：

01 李江 男 21
02 刘唐 男 23
03 张军 男 19
04 王娜 女 19

C++

#include <iostream>
#include <fstream>
using namespace std;

int main()
{
	int num,age,stu,flag=0;
	string name,gender;
	cout<<"input students' info like:01 ML female 21 and ends with 00 00 00\n";
	ofstream out("student.txt");
	while(cin>>num>>name>>gender>>age)
	{
		if(num==0)
		{
			break;
		}
		out<<num<<" "<<name<<" "<<gender<<" "<<age<<endl;
	}
	cout<<"input the number of you want\n";
	cin>>stu;
	ifstream in("student.txt");
	while(!in.eof())
	{
		in>>num>>name>>gender>>age;
		if(num==stu)
		{
			flag=1;
			cout<<num<<" "<<name<<" "<<gender<<" "<<age<<endl;	
			break;
		}
	}
	if(flag==0)
	{
		cout<<"There is no such student here\n";
	} 
	return 0;	
}

package exam2003

import (
	"fmt"
	"io/ioutil"
	"os"
	"strings"
)

//Student is used to handle information of students
func Student() {
	var num, age, flag int
    var name, gender, Snum string

    //create file and input information
	file, err := os.OpenFile("D:/stu.txt", os.O_CREATE|os.O_WRONLY|os.O_RDONLY, 0)
	if err != nil {
		fmt.Println("Failed to open file")
		return
	}
	defer file.Close()
	fmt.Println("inout the Info of studetns:01 ml female 22 and ends by 0 0 0 0")
	for {
		fmt.Scan(&num, &name, &gender, &age)
		if num == 00 {
			break
		}
		fmt.Fprint(file, num, " ", name, " ", gender, " ", age)
		fmt.Fprint(file, "\n")
	}
	fmt.Println("input the student number of you want:")
	fmt.Scan(&Snum)

    //Read out and select the students you want to query
	f, err := ioutil.ReadFile("D:/stu.txt")
	if err != nil {
		fmt.Println("read fail", err)
	}
	strArr := strings.Split(string(f), "\n")
	flag = 0
	for _, s := range strArr {
		y := strings.Split(string(s), " ")
		if y[0] == Snum {
			fmt.Printf("%s\n", y)
			flag = 1
			break
		}
	}
	if flag == 0 {
		fmt.Println("There is no such student here")
	}

}

3.输入年月日，计算该天是本年的第几天。例如 1990 年 9 月 20 日是 1990 年的第 263 天，2000 年 5 月 1 日是 2000 年第 122 天。（闰年：能被 400 整除，或能被 4 整除但不能被 100 整除。每年 1、3、5、7、8、10 、12 为大月）

C++

#include <iostream>
using namespace std;

int main()
{
	int a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
	int year,month,day,sum=0;
	cout<<"input the date:1998 06 08"<<endl;
	cin>>year>>month>>day;
	if(year%400==0||(year%4==0&&year%100!=0))
	{
		a[2]=29;
	}
	for(int i=1;i<month;i++)
	{
		sum+=a[i];
	}
	sum+=day;
	cout<<"today is "<<sum<<"th day"<<endl;
}

package exam2003

//Day is used to calculate how many days today is
func Day(year, month, day int) int {
	a := [13]int{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
	if year%400 == 0 || (year%4 == 0 && year%100 != 0) {
		a[2] = 29
	}
	sum := 0
	for i := 1; i < month; i++ {
		sum += a[i]
	}
	sum += day
	return sum
}