p258_5.java

homework : ) 找不到源码

public class p258_5
{
	public static void main(String[] args)
	{
		int A=0,B=0,C=0,D=0,F=-1;
		int X;//to deposite grades momentarily.
		
		System.out.println("Enter the grades and I'll tell you the distribution of them:"+
		" Input \"-1\"to the end.");
		do{
			X=SavitchIn.readInt();//I don't know the difference between readInt and readLine.
			if((X>100||X<0)&&X!=-1)
			{
				System.out.println("Error:there should be any grade greater than 100 or smaller than 0;");
				System.out.println("Try again or Input \"-1\" to end:");
				X=SavitchIn.readInt();
			}
			else if(X<=100&&X>=90){
				A=oneMore(A);
			}
			else if(X<=89&&X>=80){
				B=oneMore(B);
			}
			else if(X<=79&&X>=70){
				C=oneMore(C);
			}       
			else if(X<=69&&X>=60){
				D=oneMore(D);
			}
			else{
				F=oneMore(F);
			}
		}while(X!=-1);
		
		int totle=A+B+C+D+F;
		int perA=getPercentage(A,totle);//perA is the percentage of A
		int perB=getPercentage(B,totle);
		int perC=getPercentage(C,totle);
		int perD=getPercentage(D,totle);
		int perF=getPercentage(F,totle);
		
		A=getStarNo(perA);
		B=getStarNo(perB);
		C=getStarNo(perC);
		D=getStarNo(perD);
		F=getStarNo(perF);
		
		System.out.println("There are all "+totle+" grades"+" including:");
		System.out.println(A+" A grades "+perA+"%");
		System.out.println(B+" B grades "+perB+"%");
		System.out.println(C+" C grades "+perC+"%");
		System.out.println(D+" D grades "+perD+"%");
		System.out.println(F+" F grades "+perF+"%");
		
		drawGraph(A,B,C,D,F);
	}
	
	private static int oneMore(int n){
		n++;
		return n;
	}
	
	private static int getPercentage(int n,int m)
	{
		int x=(int)(100*n)/m;
		return x;
	}
	
	private static int getStarNo(int n)
	{
		n=(int)(n+1)/2;
		return n;
	}
	
	private static void drawGraph(int a,int b,int c,int d,int f)
	{
		//the three first lines;
		int i;
		System.out.print("0    ");
		for(i=1;i<9;i++){
		System.out.print(i*10+"   ");
		}
		System.out.print(90+"  ");
		System.out.println("100%");
		for(i=1;i<=9;i++){
			System.out.print("|    ");
		}
		System.out.println("|   |");
		for(i=1;i<=50;i++){
		System.out.print("*");
		}
		System.out.println( );
		
		//next ones;
		for(i=1;i<=a;i++)
		{
			System.out.print("*");
		}
		System.out.println("A");
		
		for(i=1;i<=b;i++)
		{
			System.out.print("*");
		}
		System.out.println("B");
		
		for(i=1;i<=c;i++)
		{
			System.out.print("*");
		}
		System.out.println("C");
		
		for(i=1;i<=d;i++)
		{
			System.out.print("*");
		}
		System.out.println("D");
		
		for(i=1;i<=f;i++)
		{
			System.out.print("*");
		}
		System.out.println("F");
	}
}