[Solved] How to call a method from main, even though I haven’t defined variables in main. [closed]

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You should only pass something as an argument if you need prior information to do what you want to do, so the parameters of flatfee and co. should be empty:

flatFee() { // code here }

you then declare a as a local variable:

flatFee() {
    double a;
    // do stuff
    return a * 5.0;
}

After that, you can pass the result of methods as arguments directly without using variables like so:

 picnicCost(flatFee(), MealP(), iceCreamCost());

solved How to call a method from main, even though I haven’t defined variables in main. [closed]