How to run c and c++ program in gcc on linux platform

Running C Program in gcc on Linux Platform:

Steps:
1. Create a file demo.c with a C code inside it.
      $gedit <filename>
      $gedit demo.c

                  - It will create and open demo.c file in gedit text editor where you can type your c code, save and close it.  e.g.,
#include<stdio.h>
void main()
{
    printf("Hello C");
}

2. Compile demo.c
      $gcc <source file name>
      $gcc demo.c
                 - It will compile C program and create a.out executable binary file.
3. Running demo.c
      $./<executable file name>
      $./a.out
         

Note: If you are dealing with multiple c files at a time, then it is favorable to specify a name executable which can be done as below during compile time.
    $gcc <Source file name> -o <output file name>
    $gcc demo.c -o demoout
    now you can run it as
    $./demoout  

---

     

Running C++ Program in gcc on Linux Platform:

Steps:

1. Install the 'build-essential' package.
$ sudo apt-get install build-essential                         { For Ubuntu }

2. Create a file demo.cpp with a CPP code inside it.
      $gedit <filename>
      $gedit demo.cpp

                  - It will create and open demo.cpp file in gedit text editor where you can type your cpp code, save and close it.  e.g.,
#include <iostream>
using namespace std;

int main()
{
cout << "Hello  C++";
return 0;
}

3. Compile demo.cpp
      $g++ <source file name> -o <output file name>
      g++ demo.cpp -o hellocpp
                 - It will compile C program and create a.out executable binary file.
4. Running demo.cpp
      $./<executable file name>
     $ ./hellocpp
         

---

Debugging C Program in GCC on Linux platform:

• Create C program as below
• $ gedit demo.c
• type your code in this demo.c file
• example:

#include<stdio.h>
void main()
{
   int i=0;
  while(i<10)
  {
      printf("\n %d",i); 
      i++;
  }
}

• Compile this program with -g option so that compiler can embed debugging information in executable.
• $gcc -g demo.c -o demo
• Next to start debugger run below given command.
• $gdb demo
• gdb --- debugger gets loaded.
• Now make us of below commands for various operations.
• Important gdb commands
• help [gdb-command]
• run args
• Run the program till breakpoint / end
• break [function-name | line-number]
• Insert breakpoint at specific line.
• You can have one or more breakpoints.
• delete [bp-number]
• To delete breakpoint.
• next [N]
• Debugger will execute the next line as single instruction.
• next 3,  jumps 3 lines.
• step [N]
• Same as next, but does not treats function as a single instruction, instead goes into the function and executes it line by line.
• finish
• run till end.
• continue
• continue until next breakpoint.
• where
• Same as next, but does not treats function as a single instruction, instead goes into the function and executes it line by line.
• quit
• quit debugger.