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Where should default parameters appear in a function prototype?
- a)To the rightmost side of the parameter list
- b)To the leftmost side of the parameter list
- c)Anywhere inside the parameter list
- d)Middle of the parameter list
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Where should default parameters appear in a function prototype?a)To th...
Default parameters in a function prototype
Default parameters are used in programming languages to assign a default value to a function parameter if no argument is provided for that parameter when the function is called. This allows the function to be more flexible by providing a default behavior while still allowing the option to override that behavior by passing in a different argument.
The placement of default parameters in a function prototype is important as it affects how the function can be called and how the parameters are assigned. In the case of C++, the correct placement of default parameters is to the rightmost side of the parameter list, which is option 'A'.
Explanation:
When declaring a function prototype in C++, the default parameters should be specified in the function declaration. The general syntax for a function declaration with default parameters is as follows:
```
return_type function_name(parameter1 = default_value1, parameter2 = default_value2, ...)
```
The default parameters are assigned values that will be used if no arguments are provided for those parameters when the function is called. These values are typically constants or expressions.
Example:
Let's consider an example of a function prototype that calculates the area of a rectangle:
```cpp
double calculateArea(double length, double width = 1.0);
```
In this example, the `calculateArea` function has two parameters: `length` and `width`. The `width` parameter has a default value of `1.0`, meaning that if no argument is provided for `width` when the function is called, it will default to `1.0`.
The default parameter should always appear to the rightmost side of the parameter list. This is because default parameters are assigned from right to left. If a default parameter appears in the middle of the parameter list, it can lead to confusion as to which parameter the argument is assigned to.
Conclusion:
In summary, default parameters in a function prototype should be placed to the rightmost side of the parameter list. This ensures clarity and consistency in the function declaration and allows for the proper assignment of default values when the function is called.
Default parameters are used in programming languages to assign a default value to a function parameter if no argument is provided for that parameter when the function is called. This allows the function to be more flexible by providing a default behavior while still allowing the option to override that behavior by passing in a different argument.
The placement of default parameters in a function prototype is important as it affects how the function can be called and how the parameters are assigned. In the case of C++, the correct placement of default parameters is to the rightmost side of the parameter list, which is option 'A'.
Explanation:
When declaring a function prototype in C++, the default parameters should be specified in the function declaration. The general syntax for a function declaration with default parameters is as follows:
```
return_type function_name(parameter1 = default_value1, parameter2 = default_value2, ...)
```
The default parameters are assigned values that will be used if no arguments are provided for those parameters when the function is called. These values are typically constants or expressions.
Example:
Let's consider an example of a function prototype that calculates the area of a rectangle:
```cpp
double calculateArea(double length, double width = 1.0);
```
In this example, the `calculateArea` function has two parameters: `length` and `width`. The `width` parameter has a default value of `1.0`, meaning that if no argument is provided for `width` when the function is called, it will default to `1.0`.
The default parameter should always appear to the rightmost side of the parameter list. This is because default parameters are assigned from right to left. If a default parameter appears in the middle of the parameter list, it can lead to confusion as to which parameter the argument is assigned to.
Conclusion:
In summary, default parameters in a function prototype should be placed to the rightmost side of the parameter list. This ensures clarity and consistency in the function declaration and allows for the proper assignment of default values when the function is called.
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Community Answer
Where should default parameters appear in a function prototype?a)To th...
Default parameters are defined to the rightmost side of parameter list in a function to differentiate between the normal and default parameters for example if a function is defined as fun(int x = 5, int y) then if we call fun(10) then 10 should be given to x or y because one can apply both logics like x = 10 already defined and 10 passed is for y but if compiler reads it from left to right it will think it is for x and no parameter is given for y, therefore, the compiler will give error.
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Where should default parameters appear in a function prototype?a)To the rightmost side of the parameter listb)To the leftmost side of the parameter listc)Anywhere inside the parameter listd)Middle of the parameter listCorrect answer is option 'A'. Can you explain this answer?
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