Steps taken by a compiler to execute a C program

-
//steps taken by a compiler to execute a C program
/*  1. pre processing: i) comments removal
                       ii) macros expansion
                       iii) #files inclusion
                       iv) conditional compilation
    2. compilation: converts to assembly level instructions
    3. assembling: converts to machine level instructions
    4. linking: linker combine all machine level instructions
                to create an executable file that is .exe file*/

//to understand better how compiler works follow the below step
/* A) execute "gcc -Wall -save-temps file_name.c" on vs code terminal
    u will get 4 extra files in explorer this files will show u how compiler works
        1. file_name.i : pre processed output saves in this file
        2. file_name.s : (after compilation of .i file) assembly level instructions of .i file
                        will saves here
        3. file_name.o : machine level instructions of file_name.s file content
        4. file_name.exe : linker combines all .o files and make executable file that is .exe file
        */

// Like this the compiler works or execute the C program

Comments

Post a Comment

Popular posts from this blog

Tokens in C

-
//basic syntax of a C program // a C program is made up of the collection of tokens // Token: smallest unit used in a C program is called token #include <stdio.h> int main () {     int     a // token (identifier)     ;     a     = // token (operator)     100 ;     printf     (           "softwareharaish" //token (string literal)     )     ; //token (symbol)     return //token (keyword)     0 //token (constant)     ; } // in the above c program I breaks the program into individual tokens // types of tokens i C program     /*  1. keywords: reserved words which has a special meaning in c program ()         2. identifiers: name of functions, variables ets to identifie                         (panctuators are not allowed to make id...
Read more

Variables and Data Types in C

-
//variables in C //variable: A name given to a memory location is called variable //declaring variable: type variable_name; //rules for defining a variable in C     /*1. can contain alphabets, digits and underscore(_)       2. a variable name can start with an alphabet and underscore only       3. can't start with a digit       4. whie space and reserved words are not allowed to give name of a variable       */ //Data types in C     /*1. basic data type: int, char, float, double       2. derived data type: this type of data types are created or derived by using basic data types                             array, pointers, structure, union       3. enumeration data type: emum       4. void data type: void     */ #include <stdio.h> int main () {     printf ( " %lu " , s...
Read more