Question

Consider the following statements.

struct studentType1
{
string name;
int ID;
double gpa;
};

studentType1 student1, student2;

struct studentType2
{
string name;
int ID;
double gpa;
};

studentType2 student3, student4;

Which of the following statements is valid in C++?
a. student2 = student3;
b. student1 = student4;
c. student2.ID = ID;
d. student1.ID = student3.ID

Answer 1

The valid statement in C++ among the given options is d. student1.ID = student3.ID, because it assigns an integer value of one struct member to another, regardless of the struct types.

Step-by-step explanation:

The question is related to the validity of assignments between different instances of structs in C++. Considering the provided code and the question which asks which of the following statements is valid in C++, here are the options evaluated:

• student2 = student3; is not valid because studentType1 and studentType2 are different types, even though their members look alike.
• student1 = student4; is also not valid for the same reason as the first statement.
• student2.ID = ID; is not valid because ID is not defined in this scope. The correct usage would involve assigning student2.ID to a specific integer value or to another variable that is defined.
• student1.ID = student3.ID; is valid. This is because you are assigning the value of one integer member variable to another integer member variable of a different instance.

Therefore, the correct answer is d. student1.ID = student3.ID, which is a valid assignment statement in C++.