In ubuntu you need to install build-essential for C and C++ Compilers for development work if you are a developer.
Just run following command in terminal and all the required packages for C and C++ compilers will be installed.
sudo aptitude install build-essential
Now you can test your first C and C++ programs.
1.Type following to open mytest.c file.
sudo gedit mytest.c
Add these lines and save the file.
Compile the code by the following command
cc -c mytest.c
Type following to create an executable
cc -o mytest mytest.c
Now you can run it by this command
2.To run a C++ program ,first create mytest.cpp by type:
sudo gedit mytest.cpp
add this code to the file and save.
Then run this program by following command:
g++ mytest.cpp -o mytest ./mytest