how to get a string using a string and integer?

Question

I want to get output some thing like this..

Word_1
Word_2
Word_3
.
.
.
Word_1234

etc...

I have seen sprintf and itoa etc to format string, to convert int to string. In case of sprintf I have to declare size. With "Word_"+itoa(iterator_variable), I think I can get what is needed. But is there any better way to get the desired output?

If I remember correctly, in C++ you can just concatenate numbers to a string using the += operator. If you just want to output the strings and don't have to remember them, you can probably get away with printf("%s%d\n",string.c_str(),int); or cout << string << int << endl; — RevanProdigalKnight
– RevanProdigalKnight, Commented Jul 7, 2014 at 12:05
possible duplicate of Easiest way to convert int to string in C++ — PrisonMonkeys
– PrisonMonkeys, Commented Jul 7, 2014 at 12:05
@RevanProdigalKnight Yes, but you have to convert the int to a string first. Which is why OP used itoa — Cory Kramer
– Cory Kramer, Commented Jul 7, 2014 at 12:05

ctor · Accepted Answer · 2014-07-07 13:49:19Z

1

If you have access to C++11 you could use std::to_string()

std::string s = "Word_";
std::string t = s + std::to_string( 1234 );
std::cout << t << std::endl;

answered Jul 7, 2014 at 13:49

ctor

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odedsh · Accepted Answer · 2014-07-07 12:07:16Z

0

Using c++ I like to use boost::format and boost::lexical_cast to solve these sort of problems.

answered Jul 7, 2014 at 12:07

odedsh

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Djizeus · Accepted Answer · 2014-07-07 14:02:28Z

0

I would recommend stringstreams, as they allow any strings, streams, and arithmetic types (among other things) to be concatenated into a character representation.

#include <sstream>
#include <iostream>

int main()
{
    int n1 = 3;
    int n2 = 99;
    std::stringstream ss;

    // all entries in the same stringstream
    ss << "Word_" << n1 << std::endl;
    ss << "Word_" << n2 << std::endl;
    std::cout << ss.str();

    // clear
    ss.str("");

    // entries in individual streams
    std::string s1, s2;
    ss << "Word_" << n1;
    s1 = ss.str();
    ss.str("");
    ss << "Word_" << n2;
    s2 = ss.str();
    std::cout << s1 << std::endl << s2 << std::endl;

    return 0;
}

edited Jul 7, 2014 at 14:02

Djizeus

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answered Jul 7, 2014 at 13:45

chmod_007

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