题解 | 比较版本号

/**
 * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
 *
 * 比较版本号
 * @param version1 string字符串 
 * @param version2 string字符串 
 * @return int整型
 */
#include <stdio.h>
int compare(char* version1, char* version2 ) {
    // write code here
    int i = 0, j = 0;

    while (version1[i] != '\0' || version2[j] != '\0') {
        long long num1 = 0;
        while (version1[i] != '\0' && version1[i] != '.') {
            num1 = num1*10 + version1[i++] - '0';
        }
        if (version1[i] != '\0') i++;

        long long num2 = 0;
        while (version2[j] != '\0' && version2[j] != '.') {
            num2 = num2*10 + version2[j++] - '0';
        }
        if (version2[j] != '\0') j++;

        if (num1 > num2) return 1;
        else if (num1 < num2) return -1;
    }

    return 0;
}