Turn a char array into double C

double toDouble(const char* s, int start, int stop) {
    unsigned long long int m = 1;
    double ret = 0;
    for (int i = stop; i >= start; i--) {
        ret += (s[i] - '0') * m;
        m *= 10;
    }
    return ret;
}

Source: stackoverflow.com

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