For的基础结构

For的基础结构

public class ForDeom01 {
    public static void main(String[] args) {
        //求0-100之间奇数和偶数的和
        int sumOdd = 0;
        int sumEven = 0;
        for(int i = 0;i <= 100;i++){
            if(i % 2 == 0){
                sumOdd += i;
            }else {
                sumEven += i;
            }
        }
        System.out.println("偶数和为：" + sumOdd);
        System.out.println("奇数和为：" + sumEven);
    }
}

lic class ForDemo02 {
    public static void main(String[] args) {
        //输出1000以内可以被五整除的数字，每行输出三个 for 实现
        int count = 0;
        for (int i =0;i <= 1000;i++){
            if (i % 5 ==0){
                System.out.print(i + "\t");
                count++;
                if (count % 3 ==0){
                    System.out.println();
                }
            }
        }
        // while 实现
        System.out.println("====================================================================");
        int a = 0;
        int count1 = 0;
        while (a <=1000){
            if(a % 5 ==0){
                System.out.print(a + "\t");
                count1++;
                if (count1 % 3 == 0){
                    System.out.println();
                }

            }
            a++;
        }

    }
}

public class ForDemo03 {
    public static void main(String[] args) {
        //输出九九乘法表
        for (int i = 1;i <= 9;i++){
            for (int j =1;j <= i;j++){
                System.out.print(i  + "*" + j + "=" + (i*j) +"\t");
            }
            System.out.println();
        }
    }
}