When some expression in C contains two operators with same/equal priority, the expression gets executed as per the “Associativity of Operators”, Check below program to understand, why it prints the results as “5” and not “1” $ vim associtivity_in_c.c $ gcc -o associtivity_in_c associtivity_in_c.c $ ./associtivity_in_c This program will display result as 5. Associativity of … Read more
package main // If a Go source file imports “C”, it is using cgo. The Go file will have access to anything appearing in the comment immediately preceding the line import “C”, and will be linked against all other cgo comments in other Go files, and all C files included in the build process. /* … Read more
Sometimes when we try to compile an unknown go package, we can see an error like “no buildable Go source files in”, the possible solution could be, Check if the package which shows error “no buildable Go source files in” is using C code, like import “C” in the source file, in that case, we … Read more
Copy paste the below shell script and execute on your terminal. $ vim understanding_compilation_with_gcc.sh Copy below highlighted code and run the script as, $ bash understanding_compilation_with_gcc.sh ————- code start ——————— #!/bin/bash echo “ For any given input file, the file name suffix determines what kind of compilation is done: file.c C source code that must … Read more
We will use a self explanatory bash script, you can just copy paste the below highlighted code and create a file calledtest_compilation.sh” and execute it on terminal as “bash test_compilation.sh” This code is tested on Ubuntu 15.04, Vivid. You may need to twick the script if you use a different version. The steps for compilation as … Read more
Valgrind is an instrumentation framework for building dynamic analysis tools. There are Valgrind tools that can automatically detect many memory management and threading bugs, and profile your programs in detail. You can also use Valgrind to build new tools. We will need to install valgrind for ubuntu, $ sudo apt-get install valgrind Reading package lists… … Read more
Create a test program which has some memory leaks for understanding how to debug memory leaks with electric fence, $ vim efence.c Now, we will need to install electric-fence package on ubuntu as, $ sudo apt-get install electric-fence Reading package lists… Done Building dependency tree Reading state information… Done The following NEW packages will be … Read more
Create a str_to_file.c file as contents below, OR use from github Compile above source as, $ gcc -o str_to_file str_to_file.c Test / Execute it as, $ ./str_to_file This will create myfile.txt in your current working directory where you have str_to_file binary, The code is also available at github
JAVA and JNIpre-requisite – Install Java SE Development Kit 6u14 under /usr/jdk1.6.0_14Write a JAVA class [ HelloWorld.java ] Compile the class using javac sudo javac HelloWorld.java after this HelloWorld.class file should get created.Create header file required for writing a native program sudo javah -jni HelloWorld Write a helloworld.c native c program. Create a shared library. … Read more
Lets say we want to read the contents of some file and want to operate on these contents using C program. In this case, we first need to read the complete file into buffer and work on to this character buffer to do what we want to do. Following c program, copied the contents of … Read more