题目：

题解：

int compareVersion(char * version1, char * version2){int len1 = strlen(version1);int len2 = strlen(version2);int i = 0;int j = 0;while (i < len1 || j < len2) {int num1 = 0;int num2 = 0;while (i < len1 && version1[i] != '.') {num1 = num1 * 10 + (version1[i++] - '0');}while (j < len2 && version2[j] != '.') {num2 = num2 * 10 + (version2[j++] - '0');}if (num1 < num2) {return -1;} else if (num1 > num2) {return 1;}i++;j++;}return 0;
}