Counting occurrences of a word in a file

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C

I dont know if this a right place to ask but anyway here you go:

I am trying count all occurrences word are that are in the file but i dont know how to do it but I can only do in like user have input in not from a file;

EX:

in file they have

the 50
is 20
on 5

and so on. but i couldnt get it to work.
I hope someone could help me out.

#include<stdio.h>
#include<conio.h>
#include<string.h>

void main()
{
	int i = 0, j = 0, count = 0;
	char str1[100], str2[20], str3[20];
	//clrscr();
	printf("Enter the text: ");
	gets(str1);

	printf("Enter word to count: ");
	gets(str2);

	while (str1[i] != '\0')
	{
		while (str1[i] != ' '&&str1[i] != '\0')	//copying the word from the text to a new string
			str3[j++] = str1[i++];

		str3[j] = '\0';	//assigning null character at the end of string
		j = 0;

		if ((_strcmpi(str2, str3)) == 0)	//comparing the given word with the copied word
			count++;

		if (str1[i] == '\0')
			break;
		else
			i++;
	}

	printf("No. of words are %d", count);
	_getch();
}