How to use the return value of a function with parameters inside another function

Question

All these functions are outside the int main():

int func1(int x) {

    int v1 = 6 * x;
    return v1; // the input argument will be 2, so v1 = 12
}

int func2()         


        

Answer 1

You get this error because you have to give the function all the arguments it needs. You are not giving an argument to a function so it will not work. sum() doesnt receive any arguments so it has to be called like this

sum()

func1() takes one argument so either change it to a function that takes no arguments

int func1() {

    int v1 = 6 * 2;
    return v1; // the input argument will be 2, so v1 = 12
}

but it shows that you havent thought about what you are doing and its kinda useless

or call it like this without changing the function

int v2 = func1(2) / 4;

EDIT
So you can change func2 to also get one argument and pass it to func1

int func2(int x){
    int v2 = func1(x) / 4;
 }

and in main do this

int x;
cin>>x;
func2(x);

also small thing your func2() should return int but you dont have a return statement