C Program to Count total Number of Words in a text

#include<stdio.h>
int main()
{
    char s[50];
    int i,c=0,b=0;
    /* take String input from user */
    printf("enter a string:");
    gets(s);
    for(i=1;s[i]!='\0';i++)
    {
        if(s[i]==' ' || s[i] == '\n' || s[i] == '\t')
        {  /* b count total space*/     
            b++;
            /* c count total previous space */
            if(s[i-1]==s[i])
                c++;
        }
    }
    printf("number of word in a string is %d",b-c+1);
    return 0;
}

enter a string: hello  learn    from Studyfame.com
number of word in a string is 4

Explanation of C program to count total words in the text or string

1. Take a string text from the user and store it in a variable s.
2. Iterate loop from 1 to end of string i.e '\0'. every string contains a null character at the end i.e '\0'.
3. inside a loop, count all space (' '), newline '\n', or  tab  '\t' present in string and store it in variable b. count all previous space and store it in variable c. 
4. subtract all the previous space i.e c from total space i.e b and add 1. you will get the total word in a string.

For example, Sentence:- 'learn from     studyfame'.

In the above sentence, 1 space between 'learn' and 'from'.

5 space between 'from' and 'studyfame'.

b = 5 + 1 i.e total space = 6.

c = 4 i.e four previous space exist between 'from' and 'studyfame'.

total word = b - c + 1 (6 - 4 + 1 = 3), total word=3.

time complexity: 0(n)