Calculate sum of all numbers present in a string - GeeksforGeeks

Calculate sum of all numbers present in a string - GeeksforGeeks
Given a string containing alphanumeric characters, calculate sum of all numbers present in the string.

int findSum(string str)

{

    // A temporary string

    string temp = "";

 

    // holds sum of all numbers present in the string

    int sum = 0;

 

    // read each charcater in input string

    for (char ch: str)

    {

        // if current character is a digit

        if (isdigit(ch))

            temp += ch;

 

        // if current character is an alphabet

        else

        {

            // increment sum by number found earlier

            // (if any)

            sum += atoi(temp.c_str());

 

            // reset temporary string to empty

            temp = "";

        }

    }

 

    // atoi(temp.c_str()) takes care of trailing

    // numbers

    return sum + atoi(temp.c_str());

}

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