Question

#include <stdio.h>

#include <string.h>

#define WORDLEN 20

char smallest_word[WORDLEN + 1],

largest_word[WORDLEN + 1],

word[WORDLEN + 1];

void get_first_word(void);

void get_another_word(void);

void get_word(void);

int main(void) {

get_first_word();

while (strlen(word) != 4)

get_another_word();

printf("\nSmallest word: %s\nLargest word: %s\n",

smallest_word, largest_word);

return 0;

}

void get_first_word(void) {

get_word();

strcpy(smallest_word, word);

strcpy(largest_word, word);

}

void get_word(void) {

printf("Enter word: ");

scanf("%20s", word);

}

void get_another_word(void) {

get_word();

if (strcmp(word, smallest_word) < 0)

strcpy(smallest_word, word);

else if (strcmp(word, largest_word) > 0)

strcpy(largest_word, word);

}

can you explain this code in c and the meaning

Answer 1

#define WORDLEN 20 //This is constant value through out the program.

char smallest_word[WORDLEN + 1],  

largest_word[WORDLEN + 1],

word[WORDLEN + 1];

Here we declare 3 variables, and these variables scope is global, So, they can be modified by any function.

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void get_first_word(void);

void get_another_word(void);

void get_word(void);

These are the function proto types, These functions are used in our program.

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int main(void) { // our program starts executing from here..

get_first_word(); // This is function call to get_first_word() ... so, this function will execute.

Function Definition of get_first_word():

void get_first_word(void) {

get_word(); // This is another function call..control goes to get_word()

strcpy(smallest_word, word); //copies string in word to smallest_word

strcpy(largest_word, word); //copies string present in word to largest_word.,

}

After Execution of this function, Control agian comes back to main().

---------------------------------

void get_word(void) {

printf("Enter word: ");

scanf("%20s", word);

}

Here we input the word from keyboard and since word is global variable, It can be accessed from any function.

------------------------------------------------

while (strlen(word) != 4)

get_another_word();

These lines indicate, it will call the function get_another_word() until the we read a string of length 4.

-----------------------

void get_another_word(void) {

get_word(); //This is nothing but reading string from keyboard and storing in word.

if (strcmp(word, smallest_word) < 0)

strcpy(smallest_word, word);

else if (strcmp(word, largest_word) > 0)

strcpy(largest_word, word);

}

This function compares string which we read recently and smallest_word string,

If strlen(word) < strlen(smallest_word), we replace the word with smallest_word.

else,

It compares string which we read recently and largest_word string,

If strlen(word) > strlen(largest_word), we replace the word with largest_word.

----------------------------

control comes back again to main().

This above function continues to call until w read a word of length of '4'.

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printf("\nSmallest word: %s\nLargest word: %s\n", smallest_word, largest_word);  

Here we are printing The smallest word and largest word.

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Screenshots of execution::

Enter word: Hello Enter word: Hellow Enter word: hell Smallest word: Hello Largest word: hell ... Program finished with exit code 0 Press ENTER to exit console. I

In the above example,

First we read the value Hello,

So, smallest_word contains "Hello" and largest_word also contains "Hello"

again we read the value , HelloW,

so, This time strlen(word) = 6 and strlen(largest_word) = 5.

so it will copy the value HelloW to largest_word.

Again we read the value beacuse while loop will execute until we read a word of length of 4.

Now we read word value as "hell"

Now , strlen(smallest_word) = strlen("Hello") = 5 and strlen(word) = strlen("hell") = 4,

So, 5<4 , so hell will be copied to smallest_word

As length of word is 4, The while loop breaks,

Printing smallest_word and largest_word which contains valuues "hell" and "HelloW" respectively.

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Summary:

The main aim is to find the smallest and largest length of the words that are read by user.

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