52表示数值的字符串

链接：https://www.nowcoder.com/questionTerminal/6f8c901d091949a5837e24bb82a731f2
来源：牛客网

class Solution {
public:
    bool isNumeric(char* string)
    {
        int len=strlen(string);
        int i=0,dot=0,nume=0,num=0;
        if(len==0)
            return true;
        if(string[0]==‘+‘||string[0]==‘-‘)
            i++;
       while(i<len){
            if(string[i]>=‘0‘&&string[i]<=‘9‘){
                i++;
                num=1;
            }
            else if(string[i]==‘.‘){
                if(nume>0)
                    return false;
                dot++;
                i++;
            }
            else if(string[i]==‘e‘ ||string[i]==‘E‘){
                if(nume>0 || num==0)
                    return false;
                nume++;
                i++;
                if(string[i]==‘-‘||string[i]==‘+‘)
                    i++;
                if(string[i]==‘\0‘)
                    return false;
            }
            else
                return false;
                   
        }
        if(dot>1 ||nume>1)
            return false;
        return true;
    }
};