Question

Structs (Records) Consider the following statements.

struct circleData
{
double radius;
double area;
double circumference;
};
circleData circle;

Which of the following statements is valid in C++?
a. cin >> circle.radius;
circle.area 3.14 radius radius;
b. cin > circle.radius;
circle.area 3.14 circle.radius* radius;
c. cin > circle;
d. cin >> circle.radius;

Answer 1

In C++, the correct way to input a circle's radius and calculate its area using the given struct is through option a, which utilizes the cin operator and the correct formula for the area (πr²).

Step-by-step explanation:

The C++ struct defines a compound data type that can encapsulate multiple data types into a single unit. In the context of calculating properties of a circle, such as area and circumference, using this struct, the task is to use correct syntax for assigning values.

The valid statement for entering the radius of a circle and computing its area in C++ given the struct circleData would involve using cin to read input from the user and store it in the radius member of the struct, and then using an arithmetical expression to calculate the area.

The correct statement from the options provided is a. cin >> circle.radius; circle.area = 3.14 * circle.radius * circle.radius;. This is because it correctly uses the extraction operator (cin >>) to input the radius and then calculates the area using the formula πr², where π is approximated as 3.14.