C++程序将int类型变量转换为字符串

int ip = <integer value>;
string op = std::to_string(ip);

#include <iostream>
using namespace std;
string solve(int ip) {
   //using the to_string function
   return to_string(ip);
}
int main()
{
   int ip = 10;
   string op = solve(ip);
   cout<< "The input value is: " << ip << endl;
   cout<< "The output value is: " + op << endl;
   return 0;
}

The input value is: 10
The output value is: 10

int ip = <integer value>;
ostringstream oss;
oss << ip;
string op = oss.str();

#include <iostream>
#include <sstream>

using namespace std;
string solve(int ip) {
   //using ostringstream
   ostringstream oss;
   oss << ip;
   return oss.str();
}

int main()
{
   int ip = 10;
   string op = solve(ip);

   cout<< "The input value after addition of 10 is: " << ip + 10 << endl;
   cout<< "The output value after addition of 10 is: " << op + "10" << endl;
   return 0;
}

The input value after addition of 10 is: 20
The output value after addition of 10 is: 1010

int ip = <integer value>;
char str[100];
sprintf(str, "%d", ip);
string s = str;

#include <iostream>
using namespace std;
string solve(int ip) {
   char str[100];
   sprintf(str, "%d", ip);
   string s = str;
   return s;
}

int main()
{
   int ip = 10;
   string op = solve(ip);
   cout<< "The input value after addition of 10 is: " << ip + 10 << endl;
   cout<< "The output value after addition of 10 is: " << op + "10" << endl;
   return 0;
}

The input value after addition of 10 is: 20
The output value after addition of 10 is: 1010