Linking 2 cpp files - c++

Question

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I am supposed to call the function randint to my main function but for some reason it doesn't work. I have 3 files: randint.cpp, randint.h, and main.cpp. And I am supposed to call the function from randint.cpp. I am not sure if I am supposed to just declare the function in the header file and and write the definition in the cpp file.
main.cpp
#include "std_lab_facilities_5.h"
#include "randint.cpp"
#include "randint.h"
int main()
try {
int x = randint();
cout << x;
return 0;
}
catch (exception& e) {
cerr << "error: " <<e.what() << '\n';
return 1;
}
catch (...) {
cerr << "Oops: unknown exception!\n";
return 2;
}
randint.cpp
#include "randint.h"
#include <chrono>
using namespace std::chrono;
//linear congruential pseudorandom number generator
int randint() {
//use the clock for an initial pseudorandom number
static long x = time_point_cast<microseconds>(system_clock::now()).time_since_epoch().count();
//calculate the next pseudorandom number
// parameters from glibc(?)
x = (((1103515245L * int (x)) & 0x7fffffff) + 12345)& 0x7fffffff;
return x;
}
randint.h
int randint();

Answer 1

In the .H file inside the class you want
public:
int randint();
and in the .CPP that you want to call the function you need:
randint randint; //<--- Telling the class in this case main that randint exists(second randint can be whatever name you prefer)
randint.randint(); //<--- Here you call the function
I would also recommend you to use the class wizard when creating new files.