C++ Subroutine Problem

[ConfusedLearner]

Im trying to get my program to do z=x*y and z=z+5.0 but not sure what I am doing wrong.

    #include <iostream>
    using namespace std;
    // Declaration: Tells the compiler how a function is called
    int multiply(int x, int y);
    int main()
    {
    // You can compile a call to the function with only a declaration,
    // but a definition is required for the code to run.
    std::cout << multiply(int x,int y) << '\n';
    }
    // Definition: Tells the compiler what a function does
    int multiply(int x, int y)
    {
    return x * y;
    }
        int addition(int z);
    int main()
    {
        std::cout << addition(5.0)<< '\n';
    }
    int addition(int z)
    {
        return z+5.0;
    }

[NathanOliver]

You can't have 2 main functions in one program. You either need to make 2 seperate programs or add the addition function to the first main function and get rid of the second one.

[deceptikon]

Why do you keep starting new threads for the same program? Please stick to one thread unless the questions are wildly different.