Do the return value (type ssize_t) of the C getline function and the second argument *n (type size_t) contain the same information, after invocation? Empirically, it seems that *n equals (size_t)pow(2, ceil(log2(<return value> + 1))). Is this relation true in general? Can someone explain its (in)validity, conceptually? >Solution : ssize_t getline(char **lineptr, size_t *n, FILE… Read More C getline() function: return value vs second argument
Why does printf output characters instead of data? Looking at the code, you can relatively understand what I want to do, but it is unclear why the output is like this #include <vector> #include <string> #include <cstdio> class Person { public: Person(const std::string& name, uint16_t old) : m_Name(name) , m_Old(old) { } public: std::string GetName()… Read More Why does printf output characters instead of data?
I’m very new to c++ and everything in general. I dont understand why my code doesn’t work: #include <cstdio> int main(){ int a; scanf("%d", &a); for(int i = 1; i < a; i++){ printf(" "); } printf("*"); } what I’m trying to do is make the number of spaces as the value inputted by the… Read More Not Displaying Spaces
In my program, I store data in different text files. The data belongs to an object, which I call rockets. For example, the rocket Saturn 5 has a text file labeled "Saturn5R.txt". I want an option to rename the rocket, and so I will need to rename the text file as well. I am using… Read More How do I use std::rename with variables?