For the following problems, create one main program that will a) create 4 sets of array of characters (one to be used for each function call) b) populate each array with the same symbols, lowercase and uppercase letters and numbers. c) print the elements of the array d) call each of the functions using it's own array e) print the expected output (output varies depending on the function) Functionality of the functions 1. Convert lowercase letters to uppercase letters and print the updated array 2. print the length of the array 3. print the resulting array containing only numbers 4. print the resulting array containing only lowercase letters

A required program is as follows,

#include <stdio.h>

#include <string.h>

//Define a function that converts lowercase to uppercase letters

char *lowerToUpper_string(char s[]) {

    int c = 0;

    while (s[c] != '\0') {

        //Check if array contains lower letter

        if (s[c] >= 'a' && s[c] <= 'z') {

            //Convert to upper

            s[c] = s[c] - 32;

        }

        c++;

    }

    return s;

}

//Define a function that computes the length of the array

int computeLength(char s[])

{

    int c=0;

    while (s[c] != '\0') {

        //Count characters in the array

        c++;

    }

    return c;

}

//Define a function that returns array containing only numbers

char *onlynumbers(char s[])

{

    int ascii;

    int c=0,i=0;

    while(s[c]!='\0')

    {

        ascii=(int)s[c];

        //Check if array contains a number

        if(ascii>=48&&ascii<=57)

        {

            s[i]=s[c];

            i++;

        }

        c++;

    }

    s[i]='\0';

    return s;

}

//Define a function that returns array containing only lowercase letters

char *onlyLower(char s[]) {

    for (int i = 0, j; s[i] != '\0'; ++i) {

        while (!(s[i] >= 'a' && s[i] <= 'z') && !(s[i] == '\0')) {

            for (j = i; s[j] != '\0'; ++j) {

                s[j] = s[j + 1];

            }

            s[j] = '\0';

        }

    }

    return s;

}

int main()

{

    // a)Create 4 sets of array of characters

    // b)Populate each array with same contents

    char array1[]="DavidJack89";

    char array2[]="DavidJack89";

    char array3[]="DavidJack89";

    char array4[]="DavidJack89";

    char *result1;

    int result2;

    char *result3;

    char *result4;

    //c)Print the elements of the array

    printf("%s\n",array1);

    printf("%s\n",array2);

    printf("%s\n",array3);

    printf("%s\n",array4);

    /*Call the function to convert the lowercase letters to

    uppercase letters and print the updated array*/

    result1=lowerToUpper_string(array1);

    printf("Array containing uppercase letters: %s\n\n",result1);

    // 2)Call a function to print length of array

    result2=computeLength(array2);

    printf("Length of \"%s\" is: %d\n\n",array2,result2);

    // 3)Call a function to print only numbers

    result3=onlynumbers(array3);

    printf("Array containing only numbers: %s\n\n",result3);

    // 4)Call a function to print array containing only lowercase letters

    result4=onlyLower(array4);

    printf("Array containing only lowercase letters: %s",result4);

    return 0;

}