先定义为字符串类型,字符串相加只会增加字符串的长度,将两个字符串相连。再转化成整型相加求和即可。
public class Test8 {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
System.out.print("请输入相加的个数:");
int n = s.nextInt();
String num = "0";
int sum = 0;
for(int i = 0; i < n; i++) {
num = num + 2;
sum = sum + Integer.valueOf(num);
}
System.out.println(sum);
}
}