Answer / Awashesh Kumar Tiwari

Here's an example C program to count the occurrence of each word in Shakespeare's works and save the results in a file:

```
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#define MAX_WORDS 10000
#define BUFFER_SIZE 256

struct WordCount {
char word[BUFFER_SIZE];
int count;
};

void readFile(const char *filename, struct WordCount words[], int maxWords) {
FILE *file = fopen(filename, "r");
if (file == NULL) return;

char line[BUFFER_SIZE];
char word[BUFFER_SIZE];
int index = 0;
while (fgets(line, BUFFER_SIZE, file)) {
char *token = strtok(line, " ,.n");
while (token != NULL) {
// Remove punctuation and convert to lowercase
int len = strlen(token);
for (int i = 0; i < len; ++i) {
if (!isalpha((unsigned char)token[i])) token[i] = '';
}
token[len] = '';

// Find the word in the word count array and increment its count, or add it if not found yet
int i;
for (i = 0; i < index; ++i) {
if (!strcmp(words[i].word, token)) {
words[i].count++;
break;
}
}
if (i == index) {
strcpy(words[index++].word, token);
words[index - 1].count = 1;
if (index >= maxWords) break;
}

token = strtok(NULL, " ,.n");
}
}
fclose(file);
}

void writeFile(const char *filename, const struct WordCount words[], int numWords) {
FILE *file = fopen(filename, "w");
if (file != NULL) {
for (int i = 0; i < numWords; ++i) {
fprintf(file, "%s: %dn", words[i].word, words[i].count);
}
fclose(file);
}
}

int main(void) {
const char *filename = "shakespeare.txt";
struct WordCount words[MAX_WORDS];
readFile(filename, words, MAX_WORDS);
writeFile("word_counts.txt", words, indexOfWord(words, ""));
return 0;
}

int indexOfWord(struct WordCount words[], const char *target) {
for (int i = 0; i < MAX_WORDS; ++i) {
if (!strcmp(words[i].word, target)) return i;
}
return -1;
}
```
This program reads a text file containing Shakespeare's works, counts the occurrence of each word, and saves the results in another file.

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