Creating a library of your own in C that provides certain functions.
To create this library I had to install a GCC Compiler using the MinGW Installer.
I wanted to create a library that performed 5 math functions and 5 string functions.
Hence I named it " lib_math_str "
My library had the following functions:
1. power
2. modulus
3. floor
4. ceil
5. absolute
6. length of a string
7. converting string to lower case
8. converting string to upper case
9. reversing a string
10. finding the first occurrence of a character in the string
Since I had to create a library of my own i could not import the generic math library and hence i had to write my own code to perform each of the above listed tasks.
Each logic was written in a function and called in the main function via a user driven menu.
The installer required all functions in one file.
All function declarations in one file.
And the void main in one file.
Here is the code for the main()
#include<stdio.h>
#include"lib_math_str.h"
void main()
{
int choice=0;
printf("Refer to the following information to make the choice\n\n");
printf("Math Functions:\n");
printf("1\t\t-\t\tTo find Power\n");
printf("2\t\t-\t\tTo find Modulus\n");
printf("3\t\t-\t\tTo find Floor Value\n");
printf("4\t\t-\t\tTo find Ceil Value\n");
printf("5\t\t-\t\tTo find Absolute Value\n");
printf("\nString Functions:\n");
printf("6\t\t-\t\tTo find Length of the string\n");
printf("7\t\t-\t\tTo convert the string to Lower Case\n");
printf("8\t\t-\t\tTo convert the string to Upper Case\n");
printf("9\t\t-\t\tTo Reverse the string\n");
printf("10\t\t-\t\tTo find first occurance of a character in the string\n");
printf("Enter your choice\n");
scanf("%d",&choice);
switch(choice)
{
case 1:
{
float base,index,result;
printf("Enter base and power for pow function\n");
scanf("%f%f",&base,&index);
result=power(base,index);
printf("Result of base %f raised to power %f is %f",base,index ,result);
break;
}
case 2:
{
float x,y;
printf("Enter numbers for division who's remainder is to be found\n");
scanf("%f%f",&x,&y);
float z=modulus(x,y);
printf("Remainder of %f/%f is %f",x,y,z);
break;
}
case 3:
{
float x;
printf("Enter number to find floor value of\n");
scanf("%f",&x);
int i=floorr(x);
printf("Floor value of %f is %d",x,i);
break;
}
case 4:
{
float x;
printf("Enter number to find ceil value of\n");
scanf("%f",&x);
int i=ceiil(x);
printf("Ceil value of %f is %d",x,i);
break;
}
case 5:
{
int x;
printf("Enter number to find absolute value of\n");
scanf("%d",&x);
int i=absolute(x);
printf("Absolute value of %d is %d",x,i);
break;
}
case 6:
{
char str[100];
fflush(stdin);
printf("Enter the string\n");
gets(str);
int len=length(str);
printf("Length of %s is %d",str,len);
break;
}
case 7:
{
char str[100];
fflush(stdin);
printf("Enter the string to convert to lower case\n");
gets(str);
stringlwr(str);
printf("Lower Case string is: \n%s",str);
break;
}
case 8:
{
char str[100];
fflush(stdin);
printf("Enter the string to convert to upper case\n");
gets(str);
stringupper(str);
printf("Upper Case string is: \n%s",str);
break;
}
case 9:
{
char str[100];
fflush(stdin);
printf("Enter the string to be reversed\n");
gets(str);
reverse(str);
printf("The reversed string is as follows\n%s",str);
break;
}
case 10:
{
char str[100],chr;
fflush(stdin);
printf("Enter the string\n");
gets(str);
printf("Enter the character whose first occurance is to be found\n");
scanf("%c",&chr);
int k=0;
k=fstocc(str,chr);
printf("The character %c first occurs at index %d",chr,k);
break;
}
default:
printf("Enter a valid input.\n");
}
}
Here are all the headers of functions
float power(float base,float index);
float modulus(float x,float y);
float floorr(float x);
float ceiil(float x);
int absolute(int x);
int length(char str[]);
char stringlwr(char str[]);
char stringupper(char str[]);
char reverse(char str[]);
int fstocc(char str[],char c);
Now to run this in the cmd-prompt there is a set of instructions
I created a folder named Project 2023 and added all files in it
These were the instructions to be entered in the cmd-prompt
cd C:\Project 2023
gcc -c lib_math_str.c -o lib_math_str.o
ar rcs lib_math_str.a lib_math_str.o
gcc -o Projet_Main.exe Project_Main.c -L. lib_math_str.a
Project_Main.exe
Here's how it looked:
This is how I created a library in C
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