Although there were multiple threads related to valgrind Address 0x421688c is 0 bytes after a block of size 4 alloc’d kind of questions, but all were expressed with either strlen, or ” related issues and I understand them. I am having with linked list insertion dealing with integers. I did inserti…
Tag: c++
Output system() in C on one line
I have been trying for hours to create a program that outputs something like command[/home/nerdofcode/]: by running something like: printf(“Command[“, system(“pwd”),”]: “);… But the problem I am receiving is that when I go to type input, it starts typing at command[&#…
Why the address of the pointer variable printed differently between two printf statements without any modification to the variable?
In below simple c test program two printf statements return different values. ( check last four printf statements). output : – I am running it in eclipse ide and using Ubuntu Linux. Why does it behave differently? Answer In several places you are using the wrong format specifier to printf. In particular…
Compilation with glibc 2.7 include path fails
I have compiled on my SLES 12.3 g++ 7.3 into the /FaF directory and glibc 2.27 is installed into the /FaF/glibc directory. Compiling this very simple program with g++ -c testAbs.cpp -I /FaF/glibc/include fails horribly: See the long error list. Below I inserted the first 15 lines – in total there are mo…
How to use an API in c using linux distro: ubuntu 16.04 [closed]
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 4 years ago. Improve this question I am beginner in linux and I want to use an API in C language from a certa…
dup2 paramater order confusion
I have written this simple program: What i want is, redirect the output of ls – l to a file called “theFile.txt”. The code works as i expect. What confuses me here is the order of dup2 parameters. I believe that correct order should be dup2(1, fd) – considering fd as the newFD and 1 as…
Computation time of processor varies on execution, each time by using gettimeofday() in a C program
I am trying to compare the computation time for performance comparison using different C libraries with gettimeofday() by including time.h and sys/time.h header files. I used gettimeofday() at the start and end of my computation and took the difference. But each time I execute my C code, I get fluctuating tim…
Intermittent segmentation faults in main after fork
I’m taking a class on how to learn programming multi process programs on linux on university. I’m still very green and trying my best to learn, so any thing you might see that is wrong would be welcome. I have a problem that asks me to iterate an array, one half on main process, the other half on …
Pass values from C program to Assembly language
I would like to pass values from C program to Assembly using the linked assembly method instead of inline assembly method in C. Below is the Assembly program(GCD) which is am working on. And this is the C program from with I am trying to pass the values to assembly program When I compile using the below metho…
GCC Bug, “linux” string in path replaced with “1” when using “” angle brackets to include a header through a macro
I may have found a bug in gcc. I couldn’t find anything related to this online so I want to know if anyone seen this before. I am using “Ubuntu 16.04.0 LTS” with: gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.6), but this problem can be reproduced on later gcc versions as well, gcc…