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欢迎大家指出不足,有红包！！！

• 1.正在学习英语的童鞋们，涨姿势的时候到了...

public static void main(String[] args) {
        // TODO Auto-generated method stub
        int i =(int)(Math.ceil((122-97)*Math.random()))+97;
        char c = (char)i;
        System.out.print(c+"是：");
        switch(c) {
        case 'a':
        case 'e':
        case 'i':
        case 'o':
        case 'u':
            System.out.println("元音字母");
            break;
        case 'y':
        case 'w':
            System.out.println("半元音字母");
            break;
            default :
            System.out.println("辅音字母");
        }

//被3整除的数的和
        int j = 1;
        int sum1 = 0;
        do {
            if (j%3==0) {
                sum1 += j;
            }
            j++;
        }while (j <= 100);
        System.out.println(sum1);
        //1-100的偶数和与奇数和
        int sum2=0,sum3=0,sum4=0,sum5=0;
        for (int m =1;m < 101; m++) {
            if (m%2==0) {
                sum2 += m;
            }else
                sum3 += m;
        }
        System.out.println("1-100的偶数和："+sum2);
        System.out.println("1-100的奇数和："+sum3);
        int p = 0;
        do {
            p++;
            if (p%2==0)
                sum4 += p;
            else
                sum5 += p;
        }while (p<100);
        System.out.println("1-100的偶数和："+sum4);
        System.out.println("1-100的奇数和："+sum5);

• 3.随机1-100的数，随机到88可能是第几次？

int total = 0;
            while (true) {
                total ++;
                int i = (int)Math.round(Math.random()*100);
                if (i == 88)
                    break;
            }
            System.out.println("循环了"+total+"次");

• 4.输出矩形菱形平行四边形九九乘法表，谢某人的指导

        for (int i= 0 ;i < 5; i ++) {
        for (int j = 0; j < 5; j ++) {
            System.out.print("*");
        }
            System.out.println();
    }
    System.out.println("~~~~~~~~~~~~~~~~~~~~~~~");
    for (int i = 1; i <= 5; i ++) {
        for (int j = 5-1-i; j >= 0; j --) {
            System.out.print(" ");
        }
                for (int k = 1; k <= 2*i-1; k ++) {
                System.out.print("*");  
                }
        System.out.println();
        }
    for (int i = 4; i >= 1; i--) {
        for (int j = 0; j <= 5-1-i; j ++) {
            System.out.print(" ");
                        }
        for (int k = 2*i-1; k >= 1; k --) {
            System.out.print("*");  
                }
        System.out.println();   
        }
        System.out.println("---------------------");
    for (int i = 0; i < 5; i ++) {
        for (int j = 5-i; j > 0;j --) {
            System.out.print(" ");
            }
        for (int k = 0; k < 5; k ++) {
            System.out.print("*");
            }
    System.out.println();
        } 
        System.out.println("--------------------");
        //有鸡翁一，值钱伍；鸡母一，值钱三；鸡鶵三，值钱一。凡百钱买鸡百只，问鸡翁、母、鶵各几何？
        //有鸡翁一，值钱伍；鸡母一，值钱三；鸡鶵三，值钱一。凡百钱买鸡百只，问鸡翁、母、鶵各几何？
        final int gongJi = 15;
        final int muJi = 9;
        final int xiaoJi = 1;
        int sum = 0, sum1 = 0;
        for (int m = 0; m < 20; m ++) {
            for (int w = 0; w < 33; w ++) {
                for (int c = 0; c < 301; c ++) {
                    sum = (m * gongJi + w * muJi + c * xiaoJi);
                    sum1 = (m + w + c);
                    if ((sum == 300) && (sum1 == 100))
                        System.out.println("gongJi有" + m + "muJi有" + w + "xiaoJi有" + c);
                }
            }
        }
        System.out.println("--------------------");
    for (int i = 0; i <= 9; i ++) {
        for (int j = 1; j < i+1; j ++) {
            System.out.print(i+"*"+j+"="+i*j+"\t");
        }
        System.out.println();
        }