Please answer the question or example in the uploaded photos and please explain what is going on ! The C Preprocessor:The preprocessor provides facilities for including source code from other files (useful in separatecompilation and when using library routine) and for doing conditional compilation (which is usedfrequently when writing portable code). It also provides a powerful macro facility, which can bevery useful to declare symbolic constants.Any preprocessor command starts with pound sign ( # ) which forms the beginning of thepreprocessor command. The carriage return forms the end of any preprocessor command. Now,we will consider only two of the C preprocessors' capabilities; text inclusion, and simple textsubstitution.Text inclusion:Look at this program:void main (void){printf("Hello World!\n");}Notice that the printf function has not been defined anywhere. The printf is part of a set functionused for standard input and output. These functions are defined in a separate file known as thestandard library. In order to use these functions correctly, a source code file requires informationabout their parameters and return type. This information is provided in a header file called stdio.h.All the information in the stdio.h can be brought into a source code file by use of a preprocessorinclude operation.#include The file name is stdio.h ( 'h’ for a 'h’eader file) and the fact it is surrounded by angle brackets('<...>') indicates to the preprocessor that it is to search in the system "include file" directories tofind the header file. It is possible to create your own header files and include them. You can surround the header file by double quotes ( “.“),instead of angle brackets. In this case,the preprocessor will search in the directory where it found the source file, which is including theheader file. If the header file is not found there, it will then search the system include file directoriesas well.Simple text substitution:The preprocessor #define is used to do text substitution. It is important to always remember thatthis is a very simple-minded facility, which simply replaces one text string where it finds anoccurrence of another. It is thus easy to get into trouble if you are not careful. The define commandconsists of the define keyword, a define symbol, and a replacement text.Example:#define message "Hello world!\n"int main(){printf(message);}When programming in C, mostly we make symbolic constants by using #define command. Forexample#define FALSE 0#define TRUE1Notice that there are no semicolons at the end of the preprocessor statements. This is because theyare not statements. If you want to learn more about the C preprocessor see 'man cpp’.

Name: Please answer the question or example in the uploaded photos and pleas
Uploaded: 2024-03-20T06:51:23.000Z
Channel: Bartleby
Description: Please answer the question or example in the uploaded photos and please explain what is going on ! The C Preprocessor:The preprocessor provides facilities for including source code from other files (useful in separatecompilation and when using librar