Implement atoi implementation

#1

code–>


question–>
https://practice.geeksforgeeks.org/problems/implement-atoi/1
not passing all testcases

#2

Hey @sheikhhaji18

int atoi(string str)
{
    //Your code here
    int sum=0;
    bool neg=false;
    for(int i=0;i<str.length();i++){
        if(i==0&&str[i]=='-')neg=true;//added this
        else if(str[i]>='0' and str[i]<='9' ){ //added else
            // if(str[i]=='-'){never run because  outer condn is true
            //     neg-true;
            // }
            // else{
            sum=sum*10+(str[i]-'0');
            // }
        }
        else{
            return -1;
        }
    }
    if(neg)
    return  -sum;
    return sum;
}