I’m trying to use functions from mman.h in my c code. The code compiles fine with g++/clang++, but when using gcc/clang it says that memfd_create has not been declared, however the code still runs fine. I tried compiling online with godbolt and it’s the same as locally, so I doubt it’s something wrong with my… Read More Implicit declaration of 'memfd_create'

Let’s start immediately with the example code: #include <stdio.h> #include <stdbool.h> typedef union { bool b; int i; } boolIntUnion; int main(void) { boolIntUnion val; val.i = 0; printf("i = %d; %s\n", val.i, ((val.b) ? "true" : "false")); val.i = 1; printf("i = %d; %s\n", val.i, ((val.b) ? "true" : "false")); val.i = 2; printf("i… Read More Is there a difference in undefined behaviour in C and C++ when accessing different members of different type in a union for write and read operations?

[This is the code that Im facing problems in the output is always going till infinity kinda confused on what is the issue here I have attached an image here of the question of the code 1 #include <stdio.h> int main(){ int num,last,newnum; printf("ENTER YOUR NUMBER: "); scanf("%d",&num); while (num != 7 || num !=… Read More Unable To Solve This Program In C-Language

I begin to use clang to replace gcc. But when I delete[] pointers, it gives warning. But when I change, the warning disappears. Why and how to deal with that? int *a = new int[1]; int *b = new int[1]; delete[] a, b; a.cpp:7:17: warning: expression result unused [-Wunused-value] delete[] a, b; int *a =… Read More Clang warning on delete pointers

I made one SO file and compiled it with a compile option called "-Xlinker –strip-all " to counter any reverse engineering (use clang). Thanks to this, most of the symbols of functions other than functions directly exposed to the outside do not appear (objdump -TC test.so). The question is, if a symbol is deleted like… Read More Why does the program work after removing the symbol information?

I am trying to access the students array of structs and modify a "Student" at a given index (using a for loop). However, I am trying to access it using only a pointer, not like this: students[currStudent].theory = thoeryGrade; But something along the lines of: *(studentPtr + currStudent).practical = practicalGrade; Note: The above line doesn’t… Read More How to do I access an array of structs using ONLY pointers

According to this answer, gcc and g++ have some functional differences. As confirmed by this script, the commands point to the exact same binary, effectively making them duplicates. Why is that so? $ uname Darwin $ md5 `which cc c++ gcc g++ clang clang++` fac4668657765c8dfe89d8995acfb5a2 /usr/bin/cc fac4668657765c8dfe89d8995acfb5a2 /usr/bin/c++ fac4668657765c8dfe89d8995acfb5a2 /usr/bin/gcc fac4668657765c8dfe89d8995acfb5a2 /usr/bin/g++ fac4668657765c8dfe89d8995acfb5a2 /usr/bin/clang fac4668657765c8dfe89d8995acfb5a2… Read More Why are there duplicate C/C++ compilers (e.g g++, gcc)?