The correct answer is: A. permit two different expressions to appear in situations where only one expression would ordinarily be used.
The comma operator is a special operator in C++ that allows you to group multiple expressions together. The result of the comma operator is the value of the last expression in the group.
For example, the following code will print the value of 5:
int x = 1, y = 2, z = 5;
cout << x, y, z;
The comma operator can also be used to assign values to multiple variables. For example, the following code will assign the value 5 to both x and y:
int x, y;
x = 1, y = 2;
The comma operator can also be used to call multiple functions. For example, the following code will call the function foo() and then the function bar():
foo(), bar();
The comma operator can also be used to create a list of values. For example, the following code will create a list of the values 1, 2, and 3:
int list[] = {1, 2, 3};
The comma operator is a powerful tool that can be used to simplify your code. It is important to understand how the comma operator works so that you can use it effectively.
Here is a brief explanation of each option:
Option A: The comma operator is used to permit two different expressions to appear in situations where only one expression would ordinarily be used. For example, the following code will print the value of 5:
int x = 1, y = 2, z = 5;
cout << x, y, z;Option B: The comma operator is not used to terminate loops or to exit from switch. To terminate a loop, you can use the break statement. To exit from a switch, you can use the break statement or the return statement.
Option C: The comma operator is not used to alter the normal sequence of program execution by transferring control to some other part of the program. To alter the normal sequence of program execution, you can use the goto statement.
Option D: The comma operator is not used to carry out a logical test and then take one of two possible actions, depending upon the outcome of the test. To carry out a logical test, you can use the if statement or the switch statement.
Option E: None of the above is correct.