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6.2- convert string to integer

2022-07-21 16:36:00 【syc596】

Convert a string to an integer _ Niuke Tiba _ Cattle from (nowcoder.com)

// Need to put string->char[]
// because string Low level maintenance value The array is final Modification cannot be changed 
//ASCII clock 
//'0'-48
//'1'-49
import java.util.*;
public class Solution {
    public int StrToInt(String str){
        if(str.isEmpty()){
            return 0;
        }
        char[] ch=str.toCharArray();
        //② Possible in string  +/-  And can only appear at the beginning of the string .
        // Deal with negative numbers 
        int flg=1;
        if(ch[0]=='-'){
            flg=-1;
            ch[0]='0';
        }else if(ch[0]=='+'){
            ch[0]='0';
        }
        // Business logic 
        int sum=0;
        for(int i=0;i<ch.length;i++){
            //① Any symbol... May appear in the string , Occurrence Division  +/-  Output directly when other symbols  0
            if(ch[i]<'0'||ch[i]>'9'){
                sum=0;
                break;
            }
            sum=sum*10+ch[i]-'0';
        }
        
        return flg*sum;
    }
}

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https://yzsam.com/2022/202/202207202138370162.html

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6.2- convert string to integer

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