0 — Test 585

Correct Answer: D. At least 16 bits
Explanation: Only minimum widths are guaranteed. 32-bit int is common in practice but not required. ALSO KNOW (related points): • In C++, what is sizeof(char)? → Always 1, by definition • What does std::cout << true; print in C++ without std::boolalpha? → 1 • In C and C++, is plain char signed or unsigned? → Implementation-defined • In Java, which of these is a primitive type? → boolean

Correct Answer: C. 64 bits
Explanation: long long was introduced in C++11 and C99 with a minimum width of 64 bits.

Correct Answer: C. 1
Explanation: bool values print as 1 and 0 unless the boolalpha manipulator is set.

Correct Answer: A. Implementation-defined
Explanation: char, signed char, and unsigned char are three distinct types. Whether plain char is signed depends on the platform.

Correct Answer: C. 16 bits (a UTF-16 code unit)
Explanation: Java was designed around Unicode, so its char is a fixed 16 bits, unlike C/C++ char.

Correct Answer: A. Integer is 16 bits; Long is 32 bits
Explanation: In VB.NET, Integer is 32 bits and Long is 64 bits. This change between versions is a common source of confusion. ALSO KNOW (related points): • What is the minimum width that C++ guarantees for long long? → 64 bits • In Java, how wide is the char type? → 16 bits (a UTF-16 code unit) • In VB.NET, what is the value of CInt(True)? → -1 • When a variable is used without being declared and Option Explicit is off in VB6, what is its data type? → Variant

Correct Answer: A. -1
Explanation: VB represents True as -1 (all bits set) when it is converted to a number. C# does not allow converting bool to int at all.

Correct Answer: A. Variant
Explanation: Variant is VB6's default data type. Option Explicit forces every variable to be declared.

Correct Answer: B. boolean
Explanation: String and Integer are classes. Arrays are objects.

Correct Answer: C. -128 to 127
Explanation: The range is -2^(n-1) to 2^(n-1) - 1. There is one more negative value than positive values. ALSO KNOW (related points): • In Python 3, what is the result of 2 ** 100? → The exact integer 1267650600228229401496703205376 • What is the result of adding 01111111 + 00000001 as 8-bit two's complement integers? → 10000000, which represents -128 (signed overflow) • What is the maximum value of an unsigned 16-bit integer? → 65535