题目1143：Primary Arithmetic

import java.io.IOException;import java.io.FileReader;import java.io.InputStreamReader;import java.io.BufferedReader;import java.util.Scanner;import java.lang.StringBuffer;class Main{public static final boolean DEBUG = false;public static void main(String[] args) throws IOException{Scanner cin;int a, b;if (DEBUG) {cin = new Scanner(new FileReader("d:\\OJ\\uva_in.txt"));} else {cin = new Scanner(new InputStreamReader(System.in));}while (cin.hasNext()) {a = cin.nextInt();b = cin.nextInt();if (a == 0 && b == 0) break;StringBuffer s1 = new StringBuffer(String.valueOf(a));StringBuffer s2 = new StringBuffer(String.valueOf(b));//System.out.println("s1:" + s1);//System.out.println("s2:" + s2);s1.reverse();s2.reverse();int cnt = 0;int i;int len1 = s1.length(), len2 = s2.length();int carry = 0;for (i = 0; i < len1 && i < len2; i++) {int sum = s1.charAt(i) - '0' + s2.charAt(i) - '0' + carry;//System.out.println(sum);carry = sum / 10;cnt += carry;}for (; i < len1; i++) {int sum = s1.charAt(i) - '0' + carry;carry = sum / 10;cnt += carry;}for (; i < len2; i++) {int sum = s2.charAt(i) - '0' + carry;carry = sum / 10;cnt += carry;}if (cnt == 0) {System.out.println("NO carry operation.");} else if (cnt == 1) {System.out.println(cnt + " carry operation.");} else {System.out.println(cnt + " carry operations.");}}}}