How to concatenate a string and an integer

Question

On compiling I am not able to concatenate the string.I am a little confused as to how do I concatenate.I tried to typecast and then concatenate,but that too throws an error.

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

string whatTime(int n)
{
    int h=n/3600;
    int m=n/60;
    int s=n%60;

    string s1=h + ":" + m + ":" + s;
}

int main()
{
    string s=whatTime(63);
    cout<<s;
    return 0;   
}

I am getting the error

invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'

`":"` is not a `std::string`. Adding `std::string` and `int` probably doesn't do what you want. — Yakk - Adam Nevraumont, Jun 04 '15 at 18:28
@CaptainObvlious I don't see why that matters. The error is long before the `=`. — Yakk - Adam Nevraumont, Jun 04 '15 at 18:30
Use `std::to_string` or use a `stringstream` to concat integers to strings. — Hatted Rooster, Jun 04 '15 at 18:30
possible duplicate of [C++ concatenate string and int](http://stackoverflow.com/questions/191757/c-concatenate-string-and-int) — aakansha, Jun 04 '15 at 18:46

score 3 · Accepted Answer · answered Jun 04 '15 at 18:28

You can use std::to_string to create std::string from your int values

string s1 = std::to_string(h) + ":" + std::to_string(m) + ":" + std::to_string(s);

Remember you have to return from your function!

string whatTime(int n)
{
    int h = n / 3600;
    int m = n / 60;
    int s = n % 60;

    return to_string(h) + ":" + to_string(m) + ":" + to_string(s);
}

score 1 · Answer 2 · answered Jun 04 '15 at 18:35

1

Me string not smart enuf to do dat. Must turn number to string before add to string. CoryKramer type faster. I show other way with stream. Must include sstream.

stringstream stream;
stream << h << ":" << m << ":" << s;
return stream.str();

answered Jun 04 '15 at 18:35

user4581301

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How to concatenate a string and an integer

2 Answers2