For循环

For循环

package com.kuang.struct;

public class ForDemo01 {
    public static void main(String[] args) {
        int a = 1; //初始化条件
        while (a<=100){
            System.out.println(a);
            a+=2;
        }
        System.out.println("while循环结束");

        //初始化 条件判断 迭代
        for (int i = 1; i <= 100; i++){
            System.out.println(i);
        }
        System.out.println("for循环结束");
    }
}

计算0到100 之间 奇数和与偶数和

package com.kuang.struct;

public class ForDemo02 {
    public static void main(String[] args) {
        //计算0到100 之间 奇数和与偶数和
        int oddsum = 0;
        int evensum = 0;
        for (int i = 0; i <= 100; i++) {
            if (i%2!=0){  //奇数
                oddsum+=i;
            }else{ //偶数
                evensum+=i;
            }
        }
        System.out.println("奇数的和：" + oddsum);
        System.out.println("偶数的和：" + evensum);
    }
}

用while 和 for循环输出1-1000之间能被5整除的数，每行输出3个

package com.kuang.struct;

public class ForDemo03 {
    public static void main(String[] args) {
        // 用while 和 for循环输出1-1000之间能被5整除的数，每行输出3个
        for (int i = 0; i <= 1000; i++) {
            if (i%5==0){
                System.out.print(i+"\t");
            }
            if (i%(3*5)==0){
                System.out.print("\n");
            }
        }
    }
}

打印九九乘法表

package com.kuang.struct;

public class ForDemo04 {
    public static void main(String[] args) {
        for (int j = 1; j <= 9; j++) {
            for (int i = 1; i <= j; i++) {
                System.out.print(i+"*"+j+"="+(i*j)+"\t");
            }
            System.out.println();
        }
    }
}