例如2+22+222+2222+22222(此时共有5个数相加),几个数相加有键盘控制。
- public static void main(String[] args) {
- long a , b = 0, sum = 0;
- Scanner s = new Scanner(System.in);
- System.out.print("输入数字a的值: ");
- a = s.nextInt();
- System.out.print("输入相加的项数:");
- int n = s.nextInt();
- int i = 0;
- while(i < n) {
- b = b + a;
- sum = sum + b;
- a = a * 10;
- ++ i;
- }
- System.out.println(sum);
- }
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