Question

Write C programs named mystring.h and mystring.c, containing the headers and implementations of the following functions.

1. int letter_count(char *s) computes and returns the number of English letters in string s.
2. int word_count(char *s) computes and returns the number of words in string s.
3. void lower_case(char *s) changes upper case to lower case of string s.
4. void trim(char *s) removes the unnecessary empty spaces of string s.
   

mystring.h

#include <stdio.h>

int letter_count(char *);

void lower_case(char *);

int word_count(char *);

void trim(char *);

mystring.c

#include "mystring.h"

int letter_count(char *s) 

{

// your implementation

}

void lower_case(char *s) {

// your implementation

}

int word_count(char *s) {

// your implementation

}

void trim(char *s) {

// your implementation

}

Use the provided main function to test the above functions.

#include "mystring.h"

int main(int argc, char* args[]) {

  setbuf(stdout, NULL);

  char str[100] = "     This Is    a Test   ";

  printf("\nInput string: \"%s\"", str);

  printf("\nLetter count:%d", letter_count(str));

  printf("\nWord count:%d", word_count(str));

  trim(str);

  printf("\nAfter trimming:\"%s\"", str);

  lower_case(str);  

  printf("\nAfter lower case:\"%s\"", str);

  return 0;

}

output should look like this:

Input string: "     This Is    a Test   "

Letter count:11

Word count:4

After trimming:"This Is a Test"

After lower case:"this is a test"

Answer 1

Here is the solution to above problem. I am using string.h and ctype.h for finding stringlength and checking if letter is an alphabet or converting to lowercase. Please refer to the code screenshot for indentation

HERE IS THE C CODE FOR PROGRAM

#include "mystring.h"
#include<stdio.h>
#include<string.h>
#include <ctype.h>

int letter_count(char *s)
{
   //finding string length
   int length= strlen(s);
   int i;
   int count=0;
  
   for(i=0;i<length;++i)
   { //checking if it is alphabet
       if(isalpha(s[i]))
           count++;   //incrementing count
   }
   return count;
}

void lower_case(char *s) {
   // stringlength using string.h library
   int length= strlen(s);
   int i;
   for(i=0;i<length;++i)
   {
       //using to toLower to convert to lower case
       s[i]=tolower(s[i]);  
   }
}

//counting the number of words
int word_count(char *s) {
// your implementation
   int length= strlen(s);
   int i;
   int count=0;
   for(i=0;i<length-1;++i)
   {
       //if counting for word if two consequtive space are not present
       if (s[i] == ' ' && s[i+1] != ' ')
       {
           count++;
       }
   }
   return count;

}

void trim(char *s) {
// your implementation
   int length= strlen(s);
   char * temp = (char *)malloc(sizeof(char)*length);
   int i=0;
   int j=0;
   int count=0;
   //removing prefix white spaces
   while(s[i]==' ')
   i++;
   //removing unnecessary spaces in between
   while(i<length-1)
   {
       if(!(s[i]==' '&& s[i+1]==' ') )
       {
           temp[j]=s[i];
           j++;
       }
       i++;
   }
   temp[j]='\0';
   //copying temp to original string
   for(i=0;i<strlen(temp);++i)
   {
       s[i]=temp[i];
   }
   s[i]='\0';
}

int main(int argc, char* args[]) {
setbuf(stdout, NULL);
char str[100] = " This Is a Test ";
printf("\nInput string: \"%s\"", str);
printf("\nLetter count:%d", letter_count(str));
printf("\nWord count:%d", word_count(str));
trim(str);
printf("\nAfter trimming:\"%s\"", str);
lower_case(str);
printf("\nAfter lower case:\"%s\"", str);
return 0;
}

OUTPUT OF CODE

SCREENSHOT OF CODE