a+aa+aaa+aaa+......AAAAAaAaaaaa....a是任意一个数，求最后结果中有多少个一，，，，，，怎么做啊
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多少
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应该加个什么东西啊
public class TestSum {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("请输入基数（0――9）！");
int num = sc.nextInt();
System.out.println("请输入位数！");
int n = sc.nextInt();
int sum = 0;
int result = 0;
int temp = num;
if(num<0||num>9||n<=0) {
System.out.println("输入错误！");
}else {
for(int i=1;i<n;i++) {
temp = temp*10 + num;
sum = sum + temp;
}
result = sum + num;
System.out.println(result);
}
}
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回复 2楼 caihua
public static void main(String[] args) { int i,j;
Scanner sc = new Scanner(System.in);
System.out.println("请输入基数（0――9）！");
int num = sc.nextInt();
System.out.println("请输入位数！");
int n = sc.nextInt();
int sum = 0;
if(num<0||num>9||n<=0)
{
System.out.println("输入错误！");
}
else {
for(i=0,j=1;i<n;i++,j*=10)
{
sum += ((j*10-1)/9 )* num;
}
}
System.out.println(sum);
}
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