大数加法（String）Java

最新推荐文章于 2025-05-20 23:49:00 发布

canmengmeng

最新推荐文章于 2025-05-20 23:49:00 发布

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分类专栏：算法

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class Solution {
    public String addStrings(String num1, String num2) {
        int ll1 = num1.length() - 1;
        int ll2 = num2.length() - 1;
        String res = "";
        int flag = 0;
        
        while(ll1 != -1 && ll2 != -1){
            int help = (num1.charAt(ll1) - '0') + (num2.charAt(ll2) - '0') + flag;
            if(help >= 10){
                help -= 10;
                flag = 1;
            }else{
                flag = 0;
            }
            res = help + res;
            ll1--;
            ll2--;
        }
        while(ll1 != -1){
            int help = (num1.charAt(ll1) - '0') + flag;
            if(help >= 10){
                help -= 10;
                flag = 1;
            }else{
                flag = 0;
            }
            res = help + res;
            ll1--;
        }
        while(ll2 != -1){
            int help = (num2.charAt(ll2) - '0') + flag;
            if(help >= 10){
                help -= 10;
                flag = 1;
            }else{
                flag = 0;
            }
            res = help + res;
            ll2--;
        }
        if(flag == 1){
            res = flag + res;
        }
        return res;
    }
}