Primary Arithmetic
时间: 1ms 内存:64M
描述:
Children are taught to add multi-digit numbers from right to left, one digit at a time. Many find the ``carry" operation, where a 1 is carried from one digit position to the next, to be a significant challenge. Your job is to count the number of carry operations for each of a set of addition problems so that educators may assess their difficulty.
输入:
Each line of input contains two unsigned integers less than 10 digits. The last line of input contains ``0 0''.
输出:
For each line of input except the last, compute the number of carry operations that result from adding the two numbers and print them in the format shown below.
示例输入:
123 456
555 555
123 594
0 0
示例输出:
No carry operation.
3 carry operations.
1 carry operation.
提示:
参考答案:
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