#include <iostream>
11 #include <string>
12 #include <cstdlib>
13
14 using namespace std;
15
16 int main() {
17 string s = "123";
18 double n = atof(s.c_str());
19 //int n = atoi(s.c_str());
20
21 cout << n << endl;
11 #include <string>
12 #include <cstdlib>
13
14 using namespace std;
15
16 int main() {
17 string s = "123";
18 double n = atof(s.c_str());
19 //int n = atoi(s.c_str());
20
21 cout << n << endl;
22 }
---摘自 http://www.cnblogs.com/oomusou/archive/2006/10/10/525647.html