Java语言程序设计与数据结构（基础篇）第七章答案

答案为本人求解，如有错误，还望海涵。如有雷同，纯属巧合。　　

7.1

import java.util.Scanner;

public class Main
{
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);
		System.out.print("Enter the number of students: ");
		int num = input.nextInt();
		int score[] = new int[num];
		System.out.print("Enter "+ num + " scores: ");
		for(int i = 0; i < num; i++)
		{
			score[i] = input.nextInt();
		}
		int best = score[0];
		for(int i = 1; i < num; i++)
		{
			if(best < score[i])
			{
				best = score[i];
			}
		}
		char grade[] = new char[num];
		for(int i = 0; i < num; i++)
		{
			if(score[i] >= best-10)
			{
				grade[i] = 'A';
			}
			else if(score[i] >= best-20)
			{
				grade[i] = 'B';
			}
			else if(score[i] >= best-30)
			{
				grade[i] = 'C';
			}
			else if(score[i] >= best-40)
			{
				grade[i] = 'D';
			}
			else
			{
				grade[i] = 'F';
			}
			System.out.println("Student "+i+" score is "+score[i]+" and grade is "+grade[i]);
		}
	}
}

7.2

import java.util.Scanner;

public class Main
{
	public static void main(String[] args)
	{
		int numbers[] = new int[10];
		System.out.print("Enter ten number: ");
		Scanner input = new Scanner(System.in);
		for(int i = 0; i < 10 ;i++)
		{
			numbers[i] = input.nextInt();
		}
		System.out.print("Reverse output:");
		for(int i = 9; i >= 0; i--)
		{
			System.out.print(numbers[i]+" ");
		}
	}
}