Question

java编程 计算8+88+888+8888+...

用for循环计算8+88+888+8888+...的前10项的和 请给出步骤 谢谢！

Answer 1

public class Test{
public static void main(String[] args)
{
String strNum = "";
int result =0;
for(int i=0;i<8;i++){
strNum+="8";
result+=Integer.parseInt(strNum);
}
System.out.println("8+88+888+8888...的结果为："+result);

}
}

Answer 2

public class test {
public static void main(String [] args) {
long a = 8, b = 8;
long s = 8;
String str = "8";
for ( int i = 1; i < 10; ++i ) {
s += a;
a = a * 10 + b;
str += "+" + String.valueOf( a );
}
System.out.println( str + "=\n" + s );
}
}

Answer 3

int sum=0;
int m=8
for(int i=0;i<10;i++){
sum=sum+m;
m=m*10+8;
}