用java实现9+99+999+9999+。。。=sum

用java实现9+99+999+9999+。。。=sum

public class Addtion02 {

public static void main(String [] args){ //136********

int b = 0;

int c = 0;

int sum = 0;

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

b = (int) Math.pow(10, i);

c = b - 1;

sum = sum + c;

System.out.print(c);

if(i<4){

System.out.print("+");

}

}

System.out.print("="+sum);

}

}