Implement Atoi

PROBLEM :
Your task  is to implement the function atoi. The function takes a string(str) as argument and converts it to an integer and returns it.

Input:
The first line of input contains an integer T denoting the no of test cases . Then T test cases follow. Each test case contains a string str .

Output:
For each test case in a new line output will be an integer denoting the converted integer, if the input string is not a numerical string then output will be -1.

Constraints:
1<=T<=100
1<=length of (s,x)<=10

Example(To be used only for expected output) :

Input:
2
123
21a

Output:
123
-1


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SIMPLE c++ IMPLEMENTATION :
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/*You are required to complete this method */
int atoi(string str)
{
    int len,i,no ;
    len=str.length() ;
    no=0 ;
    bool flag=false ;
   
    for(i=0;i<len;i++)
    {
        if(str[i]=='-')
            flag=true ;
        else if(!(str[i]-'0'>=0&&str[i]-'0'<=9))
            return -1 ;
        else
            no=no*10+str[i]-'0' ;
    }
    if(flag)
        return -1*no ;
    return no ;
}

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