在函数调用方面需要帮助

Question

This is my first year studying IT and c++ so I don't have much of any knowledge in c++. The question is about function calling.

The Function Header is:

bool insure(int age, bool smoker)

My task is to write down the correct function call and declare all the variables that I will use in the calling statement.

So far, this is what I've come up with:

#include <iostream>
using namespace std;

bool insure(int age, bool smokers)
{
    bool ret;
}
int main ()
{
    int age;
    bool isSmoker;
    bool ret;

    cout << "Enter your age: ";
    cin >> age;
    ret = insure(age, isSmoker);

    return 0;
}

I'd like to know if this program is correct or if I'm doing something wrong. Thanks in advance

Answer 1

You're not returning anything from insure , and you're passing it an uninitialized variable ( isSmoker ). And you're not verifying that the input worked: what happens if the user enters "abc" for his age.

Answer 2

#include <iostream>
using namespace std;

bool insure(int age, bool smokers)
{        
    if(age>=25&&smokers==true)return true;
    else return false;
}

int main ()
{        
    int age=25;
    bool isSmoker=true;
    bool ret;

    cout << "Enter your age: ";
    cin >> age;
    ret = insure(age, isSmoker);
    cout<<"Insure:"<<ret;

    return 0;
}

This code block is written assuming that insurance is true for people aged 25 yrs or more and smoker. You can change the logic inside the insure(age,smokers) function.

Answer 3

I don't see anything fundamentally too wrong with it, although:

1. You don't return anything from insure . Is this by design? Maybe you want to add return ret ?

2. You don't define starting values for any of your variables. This is bad form and may cause undefined behaviour.

Answer 4

The task sounds like you are to take bool insure(int age, bool smoker) as a black box and show how to call it. So I suppose the first question you need to answer for yourself is whether or not you are required to actually write a definition of insure or just have to show how you would use the function. Once you've resolved that,

• How many and what types of variables does insure require?
• What does insure return and how do you store it?
• How do you set up/initialize the variables you have to use for calling it and holding the value is returns?
• What sorts of error checking should you do to make sure you're passing "good" values to insure ? (Has your class covered error-checking and error-handling yet?)