Linux Programming In C - A Simple Hello World

This is a quick summary of how to write and run a C program in Linux.

A Simple Hello World

1. Issue the command "sudo nano hello-world.c" to launch the nano editor;

2. Enter the code below in nano. Press Ctrl-X then press Y to save.

#include <stdio.h>

int main()
{
   printf("Hello, World! \n");
   return 0;
}

3. Issue the command "gcc hello-world.c -o myfirstcprogram" to compile;

4. Issue the command "./myfirstcprogram" to execute it.

Reference:

HOW TO WRITE AND RUN A C PROGRAM ON THE RASPBERRY PI
http://www.circuitbasics.com/how-to-write-and-run-a-c-program-on-the-raspberry-pi/

Linux - How to solve the problem of "/usr/bin/ld: cannot find -lxxx"

When compiling applications or lib source codes, sometime we will encounter error message such as the one shown below.

/usr/bin/ld: cannot find -lxxx

Depending on the code being compiled, the error message may look like:

/usr/bin/ld: cannot find -lc

/usr/bin/ld: cannot find -lltdl

/usr/bin/ld: cannot find -lXlst

The xxx represents the name of the library, for example, libc.so, libltdl.so, libXtst.so. The naming rule is: lib + library name (i.e. xxx) + .so.