Question

A person writes a project with unit conversion functions, although she doesn’t use all of them. The conversions would be useful in a library. Create the library and modify the main.c to use the library. What is the name of your library? C PROGRAMMING

#include <stdio.h> // has printf() float inches2metres(float length_in_inches); float metres2inches(float length_in_metres); float pounds2kg(float weight_in_pounds); float kg2pounds(float mass_in_kg); float hours2seconds(float time_in_hours); float seconds2hours(float time_in_seconds); int main(void){ int i; float speed_mperhour, speed_inchespersec; printf(“speed (km/hr)        speed (in/sec) \n\r”); for (i=1; i<=100;i++) {       speed_inchespersec = metres2inches(i*1000.0)/hours2seconds(1.0);       printf(“%f          %f \n\r”, i, speed_inchespersec); } return 0; float inches2metres(float length_in_inches){ return (length_in_inches * 0.0254); // answer in metres float metres2inches(float length_in_metres){ return (length_in_metres * 39.3701); // answer in inches float pounds2kg(float weight_in_pounds){ return (weight_in_pounds * 0.453592); // answer in kilograms float kg2pounds(float mass_in_kg){ return (mass_in_kg * 2.20462) // answer in pounds float hours2seconds(float time_in_hours){ return (time_in_hours * 3600.0) // answer is seconds float seconds2hours(float time_in_seconds){ return (time_in_seconds / 3600.0) // answer is hours

Answer 1

Steps to create your own library are :

• (1) Create an INTERFACE to your library: mylib.h
• (2) Create an IMPLEMENTATION of your library: mylib.c
• (3) Create a LIBRARY OBJECT FILE that can be linked with programs that want to use our library code
• (3a) or create a SHARED OBJECT FILE from many .o files that can be linked with programs that want to use your library code
• (4) USE the library in other C code: (a) #include "mylib.h" (b) link in the libary code into a.out file
• (5) Set LD_LIBRARY_PATH environment variable for finding shared objects in non-standard locations at runtime

Now,implementing for the given program:

Then name of the library is "unitconvo.h"

2)INTERFACE: the header file to your library should contain definitions for everything exported by your library:

• function prototypes with comments for users of your library functions
• definitions for types and global variables exported by your library

#ifndef unitconvo.h
#define unitconvo.h

extern float inches2metres(float length_in_inches);

extern float metres2inches(float length_in_metres);

extern float pounds2kg(float weight_in_pounds);

extern float kg2pounds(float mass_in_kg);

extern float hours2seconds(float time_in_hours);

extern float seconds2hours(float time_in_seconds);

2)IMPLEMENTATION: create a unitconvo.c file that #includes "unitconvo.h" and contains the implementation of every function in your library.

#include "unitconvo.h"

float inches2metres(float length_in_inches){

return (length_in_inches * 0.0254); }// answer in metres

float metres2inches(float length_in_metres){

return (length_in_metres * 39.3701);} // answer in inches

float pounds2kg(float weight_in_pounds){

return (weight_in_pounds * 0.453592);} // answer in kilograms

float kg2pounds(float mass_in_kg){

return (mass_in_kg * 2.20462)} // answer in pounds

float hours2seconds(float time_in_hours){

return (time_in_hours * 3600.0)} // answer is seconds

float seconds2hours(float time_in_seconds){

return (time_in_seconds / 3600.0) }// answer is hours

3)create a LIBRARY OBJECT FILE that can be linked into other programs that use your library (use the -c option to gcc to tell it just to create an object file (a .o file) rather than an executable:

    gcc -o unitconvo.o -c unitconvo.c

4)USE the library in other programs:

    step 1: Add an include line (#include "unitconvo.h") in all program source files that use library definitions (e.g., test.c).

    step 2: Link the program's .c file with the library object file 
            (i.e. specify the unitconvo.o file as a command line argument to gcc): 

             gcc  test.c unitconvo.o

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