문제1148--Primary Arithmetic

1148: Primary Arithmetic

실행시간 제한: 1 Sec  메모리사용 제한: 128 MB
제출: 158  통과: 54
[제출] [채점기록] [묻고답하기]

문제 설명

Children are taught to add multi-digit numbers from right-to-left one digit at a time. Many find the "carry" operation - in which a 1 is carried from one digit position to be added 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.

입력 설명

Each line of input contains two unsigned integers less than 10 digits. The last line of input contains 0 0.

출력 설명

For each line of input except the last you should compute and print the number of carry operations that would result from adding the two numbers, in the format shown below. 

입력 예시 Copy

123 456
555 555
123 594
0 0

출력 예시 Copy

No carry operation.
3 carry operations.
1 carry operation.

출처/분류