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
– Yakk - Adam Nevraumont, Commented Jun 4, 2015 at 18:28
@CaptainObvlious I don't see why that matters. The error is long before the =. — Yakk - Adam Nevraumont
– Yakk - Adam Nevraumont, Commented Jun 4, 2015 at 18:30
Use std::to_string or use a stringstream to concat integers to strings. — Hatted Rooster
– Hatted Rooster, Commented Jun 4, 2015 at 18:30

Cory Kramer · Accepted Answer · 2015-06-04 18:28:44Z

3

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);
}

answered Jun 4, 2015 at 18:28

Cory Kramer

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Comments

user4581301 · Accepted Answer · 2015-06-04 18:35:16Z

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 4, 2015 at 18:35

user4581301

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