Variables And Data Types In C Plus Plus — Part 1 MCQs with Explanations

Computers use different number systems. Decimal (base-10) is what we use every day. Hexadecimal (base-16) is useful for representing colors, memory addresses, and other things. In C++, we use a special prefix to tell the compiler that a number is in hexadecimal. Option A is incorrect because suffixes (things added to the end) aren't used for this purpose in C++. Option B is also wrong. A prefix means something that comes at the beginning. Option C is close, but not quite right. It's a bit of an older style. Option D, "Prefix with 0x", is the correct answer. The '0x' prefix tells the compiler that the following number is in hexadecimal. For example: 0x1A represents the hexadecimal number 1A, which is equivalent to 26 in decimal. Therefore, the correct way to represent hexadecimal values in C++ is by prefixing them with 0x.

The output of the code cout << (5 != 2); in C++ will be 1. The expression (5 != 2) is a comparison operation that checks if 5 is not equal to 2. Since 5 is indeed not equal to 2, the expression evaluates to true . In C++, the boolean value true is represented by 1. Therefore, the output will be 1 . However, it seems there might be a misunderstanding. The correct answer should be Option C: 1. If the options provided are fixed, then the answer should be corrected to reflect the boolean output as 1.

int is the correct answer to “What is the correct keyword to declare a variable in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

myVariable is the correct answer to “Which of the following is a valid variable name in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

double is the correct answer to “What is the data type of the variable 'x' in the following declaration: double x = 3.14;”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

string is the correct answer to “Which of the following is not a primitive data type in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

2147483647 is the correct answer to “What is the maximum value that can be stored in an 'int' data type in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

1 byte is the correct answer to “What is the size of a 'char' data type in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

2 is the correct answer to “What is the result of the following expression in C++: 5 / 2”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

sizeof is the correct answer to “Which operator is used to find the size of a data type in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

const is the correct answer to “What is the correct way to declare a constant in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

FALSE is the correct answer to “What will be the output of the following code: cout << (true && false); in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

int age = 25 is the correct answer to “What is the correct syntax to declare and initialize a variable 'age' of type 'int' with a value of 25 in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

-32768 to 32767 is the correct answer to “What is the range of values for a 'short int' data type in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

Declares a variable with an inferred type is the correct answer to “What does the 'auto' keyword do in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

float is the correct answer to “Which of the following is an example of a floating-point data type in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

char is the correct answer to “What is the correct data type for storing a single character in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

1 is the correct answer to “What will be the output of the following code: cout << sizeof(char); in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

int x = 5 is the correct answer to “Which of the following is a valid way to initialize a variable in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

4294967295 is the correct answer to “What is the maximum value that can be stored in an 'unsigned int' data type in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

const double PI = 3.14159 is the correct answer to “Which of the following is the correct way to declare a constant 'PI' with a value of 3.14159 in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

8 bytes is the correct answer to “What is the size of a 'long double' data type in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

123variable is the correct answer to “Which of the following is not a valid variable name in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

Prefix with 0 is the correct answer to “What is the correct way to represent octal values in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

Indicates that a variable may be changed unexpectedly is the correct answer to “What does the 'volatile' keyword do in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

1 is the correct answer to “What is the result of the following expression in C++: 7 % 3”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

int *ptr is the correct answer to “What is the correct way to declare a pointer to an integer in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

float is the correct answer to “What is the data type of the expression: 5.2f in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

TRUE is the correct answer to “What is the output of the following code: `cout << (true || false);` in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

-128 to 127 is the correct answer to “What is the range of values for a 'signed char' data type in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

1 byte is the correct answer to “What is the size of the 'bool' data type in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

byte is the correct answer to “Which of the following is not a valid data type in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

3 is the correct answer to “What will be the result of the expression: 10 / 3 in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

const double PI = 3.14159 is the correct answer to “What is the correct way to declare a constant variable named 'PI' with a value of 3.14159 in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

float is the correct answer to “What is the data type of the expression: 3.14f in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

65535 is the correct answer to “What is the maximum value that can be stored in an 'unsigned short int' data type in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

TRUE is the correct answer to “What is the output of the following code: cout << (7 >= 7); in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

int is the correct answer to “What is the data type of the expression: sizeof('A') in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

8 is the correct answer to “What is the result of the expression: 5.0 + 3 in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.

0 to 4294967295 is the correct answer to “What is the range of values for an 'unsigned long int' data type in C++”. This question is standard in competitive examination syllabi for Variables And Data Types In C Plus Plus.