string to number in c++
// For C++11 and later versions
string str1 = "45";
string str2 = "3.14159";
string str3 = "31337 geek";
int myint1 = stoi(str1);
int myint2 = stoi(str2);
int myint3 = stoi(str3);
// Output
stoi("45") is 45
stoi("3.14159") is 3
stoi("31337 geek") is 31337string to int c++
#include <sstream>
using namespace std;
int main()
{
stringstream string_to_int;
string s1="12345";
int n1;
string_to_int<<s1;
//也可以使用string_to_int.str(s1);
//或者 s1=string_to_int.str();
string_to_int>>n1;
cout<<"s1="<<s1<<endl;//s1=12345
cout<<"n1="<<n1<<endl;//n1=12345
}Copyright © 2021 Codeinu
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