This Process is illustrated in the Figure 1 below<\/p>\n First we will see how to execute a C program in a GNU\/Linux environment. We will be using the GCC\/GDB<\/a> toolchain that comes installed by default in almost all GNU\/Linux distributions.<\/p>\n The following video link shows the different phases of the Life Cycle of a C program.<\/p>\n Life Cycle of a C Program – Click to view<\/a><\/strong><\/p>\n Consider the program given below that calculates the area of a Circle given its radius.<\/p>\n Click on the following video link shows how to compile and execute the above C program.<\/p>\n Execution of a C program using gcc compiler – Click to view<\/a><\/strong><\/p>\n TO check which version of gcc is installed Now we will see the different phases of transformation. The first phase is Preprocessing. Click on the below link to understand the phase of Preprocessing<\/strong>.<\/p>\n Preprocessing Phase – Click to view<\/a><\/strong><\/p>\n Preprocess and write to circle.i Preprocess but do not remove comments In the next video link we will see how to perform assembling, compiling and linking.<\/p>\n![\"LifeCycle\"](\"https:\/\/i0.wp.com\/moodle.sit.ac.in\/blog\/wp-content\/uploads\/2016\/07\/lifecycle.jpg?resize=1056%2C816&ssl=1\")
\n
\n\/\/ circle.c: Calculate and print the Areas of Circles
\n#include \/\/ Preprocessor directive
\n#define PI 3.1416
\n<\/code>
\n
\ndouble fnCircularArea( double r ); \/\/ Function prototype
\n<\/code>
\n
\nint main(void)
\n{
\ndouble dRadius = 1.0, dArea = 0.0;
\nprintf( \"\\tAreas of Circles\\n\\n\" );
\nprintf( \"\\t\\tRadius\\t\\tArea\\n\\t---------------------------------\\n\" );
\ndArea = fnCircularArea( dRadius );
\nprintf( \"Circle 1%14.3f\\t%15.5f\\n\", dRadius, dArea );
\ndRadius = 5.0;
\ndArea = fnCircularArea( dRadius );
\nprintf( \"Circle 2%14.3f\\t%15.5f\\n\", dRadius, dArea );
\nreturn 0;
\n}
\n<\/code>
\n
\n\/\/ The function fnCircularArea( ) calculates the Area of a Circle
\n\/\/ Parameter: Radius of the Circle
\n\/\/ Returns: Area of the Circle
\ndouble fnCircularArea( double dR )
\n{
\nreturn PI * dR * dR;
\n}
\n<\/code><\/p>\n
\n
\n$ gcc --version
\n<\/code>
\nTo compile a program circle.c and to show all warnings
\n
\n$ gcc -Wall circle.c
\n<\/code>
\nOutput Redirection
\n
\n$ gcc -Wall -o circle.x circle.c
\n<\/code>
\nExecution
\n
\n$ .\/circle.x
\n<\/code><\/p>\n
\n
\n$ gcc -E -o circle.i circle.c
\n<\/code><\/p>\n
\n
\n$ gcc -E -C -o circle.i circle.c
\n<\/code><\/p>\n