Question

When I run the following code, I get an error:

double i = 1;
double pound;
System.out.println("Kilograms\t Pounds");
for(i = 1; i<199; i+=2){
pound = i * 2.2;
System.out.println(i + "\t\t" + pound + "\n");
}

The error:

Kilograms     Pounds
1.0          2.2  
3.0          6.6000000005  
5.0          11.0  
7.0          15.400000002  

Answer 1

As Peter said, this is due to the imprecision of floating point numbers. To fix it, use printf, like this:

System.out.printf("%.0f\t\t%.1f\n",i,pound);

See here or here for more information on how to use printf.