Strings concatenation

[Fasanor]

Hi guys,
I'm new to c++ programming and I need to fulfill a vector of n strings with strings which are named in a similar way. Suppose that my strings are:
file1.txt
file2.txt
file3.txt etc...
I need my a vector like:
vector <string> files = {"file1.txt","file2.txt","file3.txt"}
This is what i managed until now:

#include <iostream>
#include <vector>
#include <fstream>
#include <string.h>
using namespace std;

int main(){

int filenumber;
cout << "Insert the number of files: " << endl;
cin >> filenumber;

string s1;
cout << "Insert the first part of file names: " << endl;
cin >> s1;
vector <string> files(n);

for(int i=1; i<n; i++){
char str[80];
strcpy(str,s1);
strcat(str,to_string(i))
files[i-1]= str;
}

for(string c : files)
cout << c << endl;

return 0;

}

But I still have issues throughout compilation. Can you fix my code? Thank you so much.

[jlb]

But I still have issues throughout compilation.

Obviously, you wouldn't be here otherwise.

Do you know the difference between a C++ std::string and a C-string?

Can you fix my code?

No, I won't "fix" your code, but I will give you hints as to what you must do.

Hint 1: You seem to know about C++ strings so stick with them. And when you do stick with std::string there will be no need of the C-string functions like strcat, and strcpy.

Also remember that in C++ vectors/arrays start at zero not one.

Do you realize that you're only trying to enter one "file name"?

Lastly for now, in future please use code tags (the <> icon to the right of the editor window) and post all of your error messages, along with the code, exactly as they appear in your development environment.

[thmm]

The only input you need is the number of files.
Once you have that you use a simple for loop to build the filename and add the filename to the vector.

Inside the for loop you only add the current number to a string with the value "file". Once you have done this you add ".txt to the string. Finally you add the string to the vector.

Vectors have a function push_back.
To add another string to string you can either use += or use append