Functions and Parameters C++ - Reading Assignment

C++ Programming
#242
  1. A function parameter is a variable that is used within a function but is initialised by the calling function.
  2. Parameters allow us to write functions in a reusable way allowing us to perform tasks and return retrieved or calculated results back to the caller without knowing what the specific inputs or outputs are ahead of time.
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#243

  1. What is a function parameter?
    A parameter is provided to a function by the caller. The function will create a variable for each parameter when it is called and the value of each parameter will be given to the according variable. This process is called pass by value.

  2. Why do functions need parameters?
    Functions which do computations need the parameters as input values. For example if a function is supposed to calculate the sum of two given values, these values habe to passed to the function by using two parameters. Otherwise the function will not know which values it should sum up.

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#244
  1. What is a function parameter?
    A variable used in a function which works almost identically to variables identified inside the function, but they are always initialized with a value provided by the caller of the function. They are placed between the parenthesis after the identifier, with multiple parameters being separated by commas.
  2. Why do functions need parameters?
    Parameters provides data for the function to work with.

Problem with the first question in the quiz:
should return an int and not void. This will produce a compiler error
#2:
main only passed one argument of two. Multiply doesn’t have a return statement.
#3
add 1,2,3 =64=24. the answer is 24
#4
int doubleNumber(int x)
{
return 2x
}

#5
int doubleNumber(int x)
{
return 2*x;
}
int main()
{
int x{};
std::cin >>x;
std: cout<<doubleNumber(x)<<’\n’;
return 0;
}

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#245
  1. A function parameter is a variable used in a function
  2. Function need parameter in order to function correctly and collect the usable data.
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#246

Actually functions that require parameters must be called with the parameters included or you’re unable to call that function at all :slight_smile:

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#247
  1. A variable defined in a function
  2. So you can pass values to it
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#248
  1. What is a function parameter?
  • It is a variable used in a function.
    When we call a function and give it an argument, a variable is created and the argument value we pass is assigned to that variable.
  1. Why do functions need parameters?
  • That way, when we call a function, we can pass arguments to a function when we call it. Otherwise, we would have to re-write the whole body with the needed values.
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#249

  1. They are values defined as variables to be processed within the function.

  2. As inputs to their data manipulation.

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#250
  1. a variable used in a function
  2. the function is a sett of instructions for data, the parameters are the data so if you want the function to run you need parameters.
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#251

1. What is a function parameter?

A function parameter is a placeholder for a value to be given to the function.

2. Why do functions need parameters?

Strictly speaking they don’t all need them - some functions perform perfectly well without them. But sometimes a function is reliant on a value to be able to execute its code properly. And depending on when the function is used may affect the value to be inserted. If the function is called multiple times this value may differ from function call to function call. It is therefore helpful to have a placeholder which may be substitued for any value.

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#252

A function can also be without parameters :slight_smile: they are useful if you want the function to make a specific operation on set parameters but if you want a function to only for example read from a keyboard, you don’t need to specify parameters for it.

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#253

hmm good to know thanks :slight_smile:

#254

1)A function parameter is a variable used in a function. Function parameters work almost identically to variables defined inside the function, but with one difference: they are always initialized with a value provided by the caller of the function.
2)Functions need parameters to pass information to a function being called as arguments so the function has data to work with.

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#255

What is a function parameter?

A function parameter passes a value from where it has been called to where it executes. Return parameters are used to pass values back to the caller statement.

Why do functions need parameters?

Functions need parameters because they cannot access local variables in other functions natively but need to operate on that data somehow.

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#256

  1. A function parameter is a variable used in a function. Unlike variables defined inside a function parameters are always initialized with a value provided by the caller of the function.

  2. Functions need parameters to pass information to a function being called, so that the function has data to work with.

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#257
  1. What is a function parameter?
    A variable used in a function. They are always initialized with a value provided by the caller of the function.
  2. Why do functions need parameters?
    It allows us to write functions that can perform tasks and return retrieved or calculated results back to the caller without knowing what the specific inputs or outputs are ahead of time.
1 Like
#258

  1. What is a function parameter? variable used in a function

  2. Why do functions need parameters? in this way they can be used multiple times using different values as inputs

2 Likes
#259

  1. What is a function parameter?
    Is a variable used in function but is always initialized with a value provided by the caller of the function

  2. Why do functions need parameters?
    They are needed for defined values otherwise there is no information to call.

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#260
  1. What is a function parameter?
    A function parameter is data that is equipped to the function.
  2. Why do functions need parameters?
    We need function parameters to save time and be more efficient.

Quiz

  1. mulitply() is void and does not return a value. A function needs to return something like int. This will not compile.
  2. No return in mulitpy(). multiply() needs to parameters and main() is only giving one argument.
    3.24.
    4.int doubleNumber(int i){ return 2 * i;}
    5.#include

int doubleNumber(int i)
{
return 2 * i;
}

int main()
{
int i{};
std::cin >> i;
std::cout << doubleNumber(i) << ‘\n’;
return 0;
}

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#261

1. What is a function parameter?
Variables that the funtion caller provides the value to

2. Why do functions need parameters?
To collect data that may be until given by the user or defined in the main function

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