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| 10035 | |
| Primary Arithmetic | |
| 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. | |
| Input | |
| Each line of input contains two unsigned integers less than 10 digits. The last line of input contains ‘0 | |
| 0’. | |
| Output | |
| 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. | |
| Sample Input | |
| 123 456 | |
| 555 555 | |
| 123 594 | |
| 0 0 | |
| Sample Output | |
| No carry operation. | |
| 3 carry operations. | |
| 1 carry operation. |