C++字符串转数字

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#include <iostream>#include <sstream>using namespace std;int stringToInt(string str){    int result;    istringstream is(str);    is >> result;    return result;}int main(){    cout << stringToInt("Hello,world!") << endl;    cout << stringToInt("0000") << endl;    cout << stringToInt("0011") << endl;    cout << stringToInt("999999999999999999") << endl;    return 0;}