Question

Create a C project named login_l06t1. Write and test a function strnclean that takes two strings as parameters, target and source. Using the ctype library, copy only the alphabetic characters from source to target, and make the characters lower case. Ex:

source: David Brown!
target: davidbrown

Prototype: void strnclean(char *target, const char *source);

How do i do this using the C type library below!

int isalnum(int c)

Returns non-zero (true) if c is an alphanumeric character, zero otherwise.

int isalpha(int c)

Returns non-zero (true) if c is an alphabetic character, zero otherwise.

int isdigit(int c)

Returns non-zero (true) if c is a digit character, zero otherwise.

int islower(int c)

Returns non-zero (true) if c is a lower-case alphabetic character, zero otherwise.

int ispunct(int c)

Returns non-zero (true) if c is a punctuation character, zero otherwise.

int isspace(int c)

Returns non-zero (true) if c is a space alphabetic character, zero otherwise.

int isupper(int c)

Returns non-zero (true) if c is an upper-case alphabetic character, zero otherwise.

It also provides a pair of character conversion functions:

int tolower(int c)

Returns a lower-case version of c if it is an upper-case alphabetic character.

int toupper(int c)

Returns an upper-case version of c if it is a lower-case alphabetic character.

Answer 1

Solution:

#include<stdio.h>
#include<string.h>
#include<stdbool.h>
#include<stdlib.h>
#include<ctype.h>

#define size sizeof(char)*100

//Prototype declaration..
void strnclean(char *target, const char *source);

int main( void )
{
    char *source = NULL;        //Source
    char *target = NULL;            //Target
    //Dynamic Memory allocation..
    target = (char *) malloc (size * sizeof (char));
    source = (char *) malloc (size * sizeof (char));

    printf("\n\n Enter the string : ");
    fgets(source, size, stdin); //Read string 1...

    //Func call to get the target..
    strnclean(target, source);
    printf("\n Source : %s" , source);
    printf("\n Target : %s\n\n" , target);

    free(source);
    free(target);
return 0;
}

/**
* Function akes two strings as parameters, target and sourcei..
* Using the ctype library, copy only the alphabetic characters
   from source to target, and make the characters lower case
*/

void strnclean(char *target, const char *source)
{
    int i = 0;
    int j = 0;
    int count =0;       //Counts the length of continuos mnatching chars
    char c;
    //Travesing the source char by char..
    for (i = 0; *(source + i) != '\0' ; i++) {
      
        c = (*(source + i));

        //Returns non-zero (true) if c is a digit character, zero else.
        if(isdigit(c))
            continue;
        //Returns non-zero (true) if c is punctuation character, else zero.
        else if(ispunct(c))
            continue;
        //Returns non-zero (true) if c is space alphabetic character,zero else.
        else if( isspace(c))
            continue;
        //Returns non-zero (true) if c is an alphabetic character, zero else.
        else if(isalpha(c)) {
            //Returns non-zero (true) if c is a lower-case alphabetic character,            //zero else.
            if(islower(c)) {
                (*(target+j)) = c;      //Assigning to target
                j++;                    //Increment j value..
            }
            else {
                //Returns non-zero (true) if c is an upper-case \
                alphabetic character, zero else.
                if(isupper(c)) {
                    //Returns a lower-case version of c if it is an \
                    upper-case alphabetic character.
                    (*(target+j)) = (tolower(c));       //Assigning to target
                    j++;
                }
            }
        }
        //Returns non-zero (true) if c is an alphanumeric character,zero else.
        else if(isalnum(c))
            continue;
    }
}

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Code Screenshot:

#include-stdio.h> #include-string.h> #include<stdboot.h> #include-stdlib.h> #include<ctype.h> #define size sizeof(char)*100 //Prototype declaration void strnclean (char *target, const char *source) int main( void char *source = NUL char *target = NULL; //Dynamic Memory allocation target(char *) malloc (size sizeof (char)); source(char*) malloc (size * sizeof (char)); //Source //Target printf("Inin Enter the string:" fgets (source, size, stdin); I/Read string 1.. . //Func call to get the target. strnclean (target, source); printf("\n Source : %s\n" printf("\n Target : %s\n\n" , target); source); , free (source); free(target); return Θ; ka Function akes two strings as parameters, target and sourcei.. Using the ctype library, copy only the alphabetic characters from source to target, and make the characters lower case

void strnclean (char *target, const char *source) int count char c //Travesing the source char by char. . for (1-0; *(source + 1) != '\0' ; i++) { //Counts the length of continuos mnatching chars c(source i)); //Returns non-zero (true) if c is a digit character, zero else if (isdigit (c)) continue //Returns non-zero (true) if c is punctuation character, else zero else if(ispunct (c)) continue //Returns non-zero (true) if c is space alphabetic character,zero else. else if isspace (c)) continue; //Returns non-zero (true) if c is an alphabetic character, zero else else if(isalpha(c)) //Returns non-zero (true) if c is a lower-case alphabetic character, //zero else if(islower(c)) (target+j)) c; //Assigning to target //Increment j value else //Returns non-zero (true) if c is an upper-case alphabetic character, zero else. if(isupper (c))t //Returns a lower-case version ofc if it is an upper-case alphabetic character. (target+j))(tolower(c)); //Assigning to target //Returns non-zero (true) if c is an alphanumeric character,zero else else if(isalnum(c)) continue

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Output:

                  
Enter the string David Brown! SourceDavid Brown! Target: davidbrown

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