CODEWITHSUNDEEP
c++string
blood
blood

Reputation: 746

how do i add a int to a string

i have a string and i need to add a number to it i.e a int. like:

string number1 = ("dfg");
int number2 = 123;
number1 += number2;

this is my code:

name = root_enter;             // pull name from another string.
size_t sz;
sz = name.size();              //find the size of the string.

name.resize (sz + 5, account); // add the account number.
cout << name;                  //test the string.

this works... somewhat but i only get the "*name*88888" and... i don't know why. i just need a way to add the value of a int to the end of a string

Upvotes: 5

Views: 4558

Answers (5)

den bardadym
den bardadym

Reputation: 2825

you can use lexecal_cast from boost, then C itoa and of course stringstream from STL

Upvotes: 0

Georg Fritzsche
Georg Fritzsche

Reputation: 99122

You can use string streams:

template<class T>
std::string to_string(const T& t) {
    std::ostringstream ss;
    ss << t;
    return ss.str();
}

// usage:
std::string s("foo");
s.append(to_string(12345));

Alternatively you can use utilities like Boosts lexical_cast():

s.append(boost::lexical_cast<std::string>(12345));

Upvotes: 4

Bertrand Marron
Bertrand Marron

Reputation: 22220

Use a stringstream.

#include <iostream>
#include <sstream>
using namespace std;

int main () {
  int a = 30;
  stringstream ss(stringstream::in | stringstream::out);

  ss << "hello world";
  ss << '\n';
  ss << a;

  cout << ss.str() << '\n';

  return 0;
}

Upvotes: 4

Brian R. Bondy
Brian R. Bondy

Reputation: 347586

Use a stringstream. 

int x = 29;
std::stringstream ss;
ss << "My age is: " << x << std::endl;
std::string str = ss.str();

Upvotes: 1

dirkgently
dirkgently

Reputation: 111316

There are no in-built operators that do this. You can write your own function, overload an operator+ for a string and an int. If you use a custom function, try using a stringstream:

string addi2str(string const& instr, int v) {
 stringstream s(instr);
 s << v;
 return s.str();
}

Upvotes: 5

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