java - "VARIABLE NAME cannot be resolved to a variable" in nested loops -

our task create table listed powers of number inputted user maximum exponent inputted. requirement use of nested loops , that's problems arose. or ideas appreciated.

    `//method powers table   public static void powers(){    system.out.print("enter base: ");    int base = console.nextint();    system.out.print("enter maximum exponent: ");    int exponent = console.nextint();    system.out.print("the base " + base);    system.out.println(" , maximum exponent " + exponent);    system.out.println();    system.out.println("powers of " + base);    system.out.println();    system.out.print("x\t");    system.out.println(base + "^x");     for(int = 0;i <= exponent;i++){      for(int = (int)math.pow(base, i);a <= exponent;a++);      system.out.print(i + "\t");      system.out.print(a);                        //error happens here variable "a"     }    system.out.println();   }`