01 Jul c++ language structures and pointers
Question Description
1. You have a struct defined as
struct Coordinate
{
int x;
int y;
};
And you have variables defined from it:
Coordinate point1;
Coordinate point2;
Show just the code needed to access the y value of point2.
2.
The formula to find the distance between two points is:
distance.PNG
Using the struct definition in the previous questions, show the code needed to find the distance between point1 and point2, using cmath functions as needed.
Show just the line of code to produce the distance – do not show any include statements or an entire program.
3.
A pointer is a variable that contains a value that is
4.
How would you use the parameter f in the body of this function to access the numerator field?
void reduce(Fraction &f)
{
}
f->numerator
f*numerator
f.numerator
5.
The function argument in the previous question is defined as a
pointer variable
reference variable
primitive variable
6.
You have this definition:
struct FractionArray
{
Fraction *fractions;
int nFractions;
};
And these statements:
FractionArray fractions;
fractions.nFractions = 100;
fractions.fractions = new Fraction[fractions.nFractions];
Using the new operator as in the code above means that you are
creating a variable
creating a pointer
initializing a pointer by asking the system to allocate some memory
initializing a reference variable
7.
Once you dynamically allocate memory, and you no longer need it to use it, what do you do?
nothing
return the memory to the system
set the value of the pointer to 0 New Question New Question
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