C and C++ Coding

Question 1

Cout is an object.

Accepted Answer

True

Answer

In C++, `cout` is indeed an object, specifically an object of the `ostream` class. It is part of the `iostream` library and is used for sending data to the standard output device, typically the console. As an object, `cout` has various member functions and properties that facilitate formatted output.

Question 2

If an is an integer variable, a=7/3; will yield a result of

Accepted Answer

2

Answer

When performing integer division in many programming languages (like C, C++, or Java), if both operands are integers, the result will also be an integer, and any fractional part is truncated. For `a = 7 / 3;`, the mathematical result is approximately 2.33. Since `a` is an integer variable, the `.33` is discarded, yielding `2`.

Question 3

Which of the statements below is true?

Accepted Answer

Strcmp(s1, s2) returns 0 if s1==s2

Answer

The `strcmp` function in C/C++ is used to compare two strings lexicographically. It returns `0` if the two strings, `s1` and `s2`, are identical. A negative value is returned if `s1` is lexicographically less than `s2`, and a positive value if `s1` is greater than `s2`.

Question 4

What happens when we use a class with parameterized constructors but no default constructor in a program to create an object that requires a zero-argument constructor?

Accepted Answer

Compile-time error.

Answer

If a class explicitly defines one or more parameterized constructors but no default (zero-argument) constructor, the compiler will not automatically generate a default constructor. Consequently, attempting to create an object of that class without providing any arguments (e.g., `MyClass obj;`) will result in a compile-time error. The compiler cannot find a matching constructor to instantiate the object.

Question 5

The allowable range for integer constants in a 16-bit compiler is __________.

Accepted Answer

-32768 to 32767

Answer

A 16-bit signed integer uses one bit for the sign and 15 bits for the magnitude of the number. This allows it to represent 2^15 positive values (0 to 32767) and 2^15 negative values (-1 to -32768). Therefore, the standard range for a 16-bit signed integer is from -32768 to 32767.

Online Coding Lessons Practice Test

Online Coding Lessons Practice Test

C and C++ Coding