Basics

Question 1

On windows the compiler creates obj files, on linux the compiler creates o files, what is the part that puts the executable together?

Answer 1

The linker will create the executable

Question 2

How can I check the size of a datatype or array etc?

Answer 2

sizeof operator

Question 3

Whats the difference between a signed int and an unsigned int

Answer 3

A signed integer is a 32-bit datum that encodes an integer in the range [-2147483648 to 2147483647]. An unsigned integer is a 32-bit datum that encodes a nonnegative integer in the range [0 to 4294967295]. The signed integer is represented in twos complement notation.

Question 4

Given that the first array element is accessible at index 0, what is the index for the last element?

Answer 4

-1

Question 5

Vectors are a better way to deal with arrays in C++, they support lots of inbuilt methods such as size, push_back etc. They are also resizable. How can I store and get a value at index 0?

Answer 5

theVectorName.at(0) = 1;

Question 6

How can I perform an explicit type cast?

Answer 6

static_cast(number)

Question 7

Which library can help with testing and converting characters?

Answer 7

include

Question 8

What is a library that can be used to work with C style strings?

Answer 8

include

Question 9

How can I assign a value to an unassigned c style string:

char name[8];

Answer 9

strcpy(name, “Frank);

Question 10

How can I get the length of a C string?

Answer 10

strlen(str)

Question 11

How can I compare a C style string?

Answer 11

strcmp(str, “Another”); // > 0

Question 12

What lib can I use to convert C style strings to other types?

Answer 12

include

Question 13

What is the type size_t used for?

Answer 13

size_t is the unsigned integer type of the result of sizeof , _Alignof (since C11) and offsetof, depending on the data model.

size_t is commonly used for array indexing and loop counting. Programs that use other types, such as unsigned int, for array indexing may fail on, e.g. 64-bit systems when the index exceeds UINT_MAX or if it relies on 32-bit modular arithmetic.

Question 14

C type strings are static in size, are C++ strings static or dynamic?

Answer 14

Dynamic

Question 15

How can I concatenate C++ strings?

Answer 15

string p = string1 + string2;