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I have a very basic question how can I assign a string value to a variable that already has integer value. For example, int a = 10 then I need to assign a ='hey'. Is it possible in c++?
I think you are new to C++? In C++ you assign the variable a fixed type (int in your case). It is not possibile to change that type inside the scope. You have to convert a to a string and save them in a new variable. How to convert a string (char* or std::string) you can look here:
Easiest way to convert int to string in C++
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Is there any difference in output behaviour between using size(x) instead of x.size(), where x is a string variable? Or it is just another alias?
The behavior of std::size is:
Returns the size of the given container c or array array.
1-2) Returns c.size(), converted to the return type if necessary.
...
So calling std::size(x) and x.size() has the same effect, where x is a std::string.
(This function can also accept an array, but that's not relevant when it comes to a std::string).
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I always wondered why one can't just convert null-terminated C string into std::string(without constructors, writing helper functions and other workarounds)? It appears to be a simple and overly commonplace problem, where you have, let's say argv[1] null-terminated string as an argument passed to your program(or any other naturally occurred C string) and you need to pass it's value to a function directly.
I.e
How do I wrap the cstr in-place without allocating new string object?
This is the answer as best I can tell.
const char * cstr = "Hello World.";
...
..myfunc(cstr);
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I am having problems in understanding this statement. I don't know why this is not usual like others.
Assignment means giving a new value to an already existing object. Even though const char INITIAL='G'; has an = sign, it is not an assignment, because it is creating a new object, not modifying an existing one. char INITIAL; INITIAL='G'; would be an assignment, because INITIAL already exists when the new value is, well, assigned.
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I am extremely new to C++ so I'm probably asking a very trivial question, but if you could help that'd be great!
I have an array[n].
Indexed from 0 to some unknown value.
I need to access the index of the array, the n value but I need to do so in binary. I am intending to do a bit reversal on it.
So, if I have an array of 2048 points how do I represent the 1024 array in binary?
If you want to write a value in binary, you can do so in C++14 with
int my_binary_value = 0b01010101;
If you'd like to test a specific bit of an int, you can do that by masking it, i.e.
bool is_bit_4_set = my_binary_value & 0b00001000;
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I have a file like:
a [able%5:00:00:capable:00] [able] capable
a [abnormal%3:00:00::] [abnormal]
a [absent%3:00:00::] [absent]
a [absolute%3:00:00::] [absolute] perfect or complete
a [abstract%3:00:00::] [abstract] existing only in the mind
a [abundant%3:00:00::] [abundant] plentiful
I want to get first column "avle", "abnormal" etc to my object. How to crop them and how storage them?
Use the string tokenizer, the best/easiest way to split a line into different variables.
char* word = strtok(line," [%:]");
char* word2 = strtok(0," [%:]");
int value = strtoi(strtok(0," [%:]"));
to store there is a vector container, but there can be used any type of arrays, what is more convenient