Java的新手，学习速度很快，但无法弄清楚为什么我的for循环不会打印

Question

public class poundtokilogram {
public static void main(String[] args) {
    System.out.println("Kilograms     Pounds   |   Pounds     Kilograms");
    System.out.println("-----------------------------------------------");

    int kilos = 1;
    int pounds = 20;

    for ( kilos = 1; kilos > 200; kilos++ ) {
        for ( pounds = 20; pounds > 515; pounds++) {
            double kiloc = pounds * .453;
            double poundc = kilos * 2.2;
            System.out.print(kilos + "    " + poundc + " | " + pounds + "     " + kiloc + "\n");
        }
    }
}

}

Here's the code, essentially I'm trying to print out a conversion chart with kilograms to pounds on one side and pounds to kilograms on the other (it's just an exercise in a book I'm learning from) and for some reason when I go to run this it will only print out the first two lines. BTW, first time posting to StackOverflow, suggestions on how to be more clear would be appreciated.

Answer 1

you are checking kilos are greater than 200 and pounds greater than 515

change this

for ( kilos = 1; kilos > 200; kilos++ ) { 
for ( pounds = 20; pounds > 515; pounds++) {

to

for ( kilos = 1; kilos < 200; kilos++ )
for ( pounds = 20; pounds < 515; pounds++) {

Answer 2

Your outer loop is not even starting because the condition is that kilos must be greater than 200. I suppose you want to say: kilos < 200

Also, in the inner loop you have pounds > 515 but you are not modifying pounds before the condition is evaluated. Change the condition to pounds < 515 (that is what I think you want to execute)