Classic Loops in Java

1-1000 the sum of the number of conventions = itself

public class demo1{

public static void Main (string[] args) {

for (int i=1;i<1000;i++) {

int sum=0;

for (int j=1;j<i;j++) {

if (i%j==0) {

Sum +=j;

}

}

if (sum==i) {

System.out.println (i);

}

}

}

}

2. tab 5 rows 5 rows multiplied by 10 by 100 columns in turn

public class Demo19 {

public static void Main (string[] args) {

System.out.println ("N" + "\ T" + "10*n" + "\ T" + "100*n" + "\ T" + "1000*n");

for (int i=1;i<=5;i++) {

int sum=1;

for (int j=0;j<=3;j++) {

Sum*=10;

System.out.print (i*sum+ "\ t");

}

System.out.println ();

}

}

}

3. Enter a number, this number multiplication table

public class Demo2 {

public static void Main (string[] args) {

Scanner input=new Scanner (system.in);

System.out.println ("Please enter a number:");

int Num=input.nextint ();

for (int i = 1; I <=num; i++) {

for (int j = 1; J <=i; J + +) {

System.out.print (j+ "*" +i+ "=" +i*j);

System.out.print (' \ t ');

}

System.out.println ();

}

}

}

Classic Loops in Java