C Programming not C++ Write the following functions, consistent with the prototy

Question

C Programming not C++

Write the following functions, consistent with the prototypes shown: int strlen(char* s); Given a string, return the number of characters in the string, NOT INCLUDING the null at the end. char* strcpy(char* si, char* s2); The function will copy the string s2 into the string s1. Note the function returns the address of the string. char* strcatfchar* si, char* s2); The function concatenates the string s2 into the end of string s1. If s1 is "Hello " and s2 is "World" before, after calling strcat, s1 will be "Hello World" Important: Do NOT use the C library routines. Do implement the functions EXACTLY as prototyped (i.e., no extra parameters, no fewer parameters, etc.) You may use the functions as "building blocks". Write main() functions to test and debug each of the above string functions, using gets() and puts() for string input and output as follows: To demonstrate strlen(), input your first name using gets() and use printf to print the string followed by the number of characters in the string. An input of "Ken" would print 3. Show this with 3 different string input examples. To demonstrate strcpy(), input your first name using gets(s1) and use strcpy() to copy it to a second string, s2 and print both strings with puts(). So an input of "Ken" would print: "stringl = Ken string2 = Ken". To demonstrate strcat(), use gets() to input your first name, last name, and ID as three separate strings, print them out, one per line, concatenate the three strings, and then use puts() to print out Hello followed by your name and ID. If the three input strings entered are "Ken" "Arnold" and "876543210", then it should print:

Explanation / Answer

/*

* Define three main function according to your requirement strlen, strcpy, strcat

* use put according to you requirement

*/

#include <stdio.h>

// this function use for get string lenght and return lenght

int strlen(char * s){

    int c = 0;

   for(int i=0; s[i] != 0;i++)

                {

                                c++;

                }

   return c;

}

// this function use for s1 to s2 and return s2

char* strcpy(char * s1, char* s2){

    int i;

    for(i=0; s1[i]!=''; ++i)

    {

        s2[i]=s1[i];

    }

    s2[i]='';

    return s2;

}

// this function use for concat s1 with s2

char* strcat(char * s1, char* s2){

    int l;

    for(l=0;s1[l]!='';l++);

     for(int i=0;s2[i]!='';i++)

         s1[l++]=s2[i];

     s1[l]='';

    return s1;

}

int main()

{

    //char userInput[256];

    char s1[256], s2[256], s5[256], s6[256];

    // user input first name

    printf ("Enter first name: ");

    gets (s1);

    // user input last name

    printf ("Enter last name: ");

    gets (s5);

    // user input ID

    printf ("Enter ID: ");

    gets (s6);

    // cout s1 lenght

    int char_count = strlen(s1);

    printf ("Number of char in string :- ");

    printf ("%d ",char_count);

   

    char* char_copy = strcpy(s1,s2);

   

    // add string1 message here

    char s3[256] = "String1= ";

    // concat string1 message with s1 value

    char* char_copys = strcat(s3,s1);

    // add string2 message here

    char s4[256] = " String2= ";

    // concat string2 message with s2 value

    char* char_copys2 = strcat(s4,char_copy);

    // concat string1 message with string2 message

    char* char_copys3 = strcat(char_copys,char_copys2);

   

    // final out show here

    printf ("So an input of %s would print:- ", s1);

    puts(char_copys3);

   

    // cretae hello before name

    char s7[256] = "Hello ";

    // concat hello message with first name

    char* hello_msg = strcat(s7,s1);

    // this code use for add space between first name and last name

    char s8[256] = " ";

    char* str_with_space = strcat(hello_msg,s8);

    // concat hello message with last name

    char* first_last = strcat(str_with_space,s5);

    // this code use for add space between name and ID

    char s9[256] = " ";

    char* name_with_space = strcat(first_last,s9);

    // concat with ID

    char* user_list = strcat(name_with_space,s6);

    // print first name

    puts(s1);

    // print last name

    puts(s5);

    // print ID

    puts(s6);

    // print final message here with puts

    puts(user_list);

    return 0;

}

User Input : -

Enter First name: ken

Enter last name: Arnold

Enter ID: 876543210

Output : -

Number of char in string :- 3

So an input of ken would print:- String1 = ken String2= ken

ken

Arnold

876543210

Hello ken Arnold 876543210

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