C++ MCQ - Basic Objective Questions - Set 1

Explanation
Upon the successful completion of a program, it is standard practice to return the value 0 to the operating system. This value indicates that the program executed successfully without any errors or issues. Other values, such as -1 or 1, may be used to indicate specific error conditions or different types of successful completions, but the most common and generally accepted value to return is 0.

Explanation
The correct answer is "main()". In C++, the main() function is the entry point for all C++ programs. It is the function where the program starts its execution. Without the main() function, a C++ program cannot be executed.

Explanation
The punctuation used to signal the beginning and end of code blocks is { }. This is commonly used in programming languages like C, C++, Java, and JavaScript. The opening curly brace { signifies the start of a code block, while the closing curly brace } signifies the end of the code block. This helps in organizing and structuring the code by defining the scope of the block and making it easier to read and understand.

Explanation
In C++ programming language, most lines of code are ended with a semi-colon (;). This punctuation is known as a statement terminator and it indicates the end of a line of code. It is important to include the semi-colon at the end of each line in order for the code to be properly compiled and executed.

Explanation
The correct comment is "/* Comment */". This is because comments in programming languages are typically denoted by using a specific syntax, such as "//" or "/* */". In this case, the comment is enclosed within "/* */", making it the correct option.

Explanation
The variable type "real" is not a correct variable type. In most programming languages, "real" is not a valid keyword for defining variables. Instead, the correct keyword for representing decimal numbers is "float" or "double". The other options listed (float, int, and double) are all valid variable types commonly used in programming.

Explanation
The correct operator to compare two variables is ==. This operator checks if the values of the two variables are equal.

Explanation
The answer "All of the above" is correct because all the options listed (1, 66, .1, -1) are true. Each option represents a different numerical value, but they are all valid and true in their own right. Therefore, the statement "All of the above" accurately reflects the truth of each individual option.

Explanation
The boolean operator for logical-and is "&&". It is used to combine two boolean expressions and returns true if both expressions are true, otherwise it returns false.

Explanation
The expression !(1 && !(0 || 1)) can be evaluated as follows:
First, the innermost parentheses (0 || 1) evaluate to true because it represents the logical OR operation between 0 (false) and 1 (true).
Next, the expression !(0 || 1) evaluates to false because it represents the logical NOT operation on the result of the previous step.
Finally, the expression !(1 && !(0 || 1)) evaluates to true because it represents the logical NOT operation on the result of the logical AND operation between 1 (true) and the previous step (false). Therefore, the correct answer is True.