powers of 2 java code help with my input different outcome -

import java.util.scanner;  public class powersof2 {     public static void main(string[] args)     {         int inputpowersof2;                 int powerof2 = 1;            int exponent;         int exponent2;          scanner scan = new scanner(system.in);          system.out.println("how many powers of 2 printed?");         inputpowersof2 = scan.nextint();         system.out.println("\n\n");         if(inputpowersof2 >= 2)         {             system.out.println("here first " + inputpowersof2 + " powers of 2:");             system.out.println();         }         else         {             system.out.println("here first power of 2:");             system.out.println();         }          exponent2 = 0;         exponent = 0;         while(exponent <= inputpowersof2)         {             system.out.print("2^" + exponent2 + " = ");             exponent2++;             system.out.println((powerof2 = 2 * powerof2) / 2);             exponent++;         }     } } 

why when give me 1 power of 2 prints

2^0 2^1 

and when give me 2 powers of 2 prints

2^0 2^1 2^2 

and on...

replace

while(exponent <= inputpowersof2) 

with

while(exponent < inputpowersof2) 

as others said in comments, very, easy solve using debugger.

hope helps,