How to count number of words found in a string in c

Question

I'm trying to write a program which counts the number of words found in a string, however the program which I wrote counts the number of spaces. How do I construct this program - as efficient as possible - to count the number of words? What do I do say the string contains 4 words and 8 spaces, or if it contains no words and only spaces? What am I missing/doing wrong?

#include <stdio.h>
#include <cs50.h>
#include <ctype.h>
#include <string.h>
int main(void)
{
string text = get_string("Text: ");
int count_words = 0;
for (int i = 0, n = strlen(text); i < n; i++)
{
    if (isspace (text[i]))
    {
        count_words++;
    }
}
printf("%i\n", count_words + 1);
}

chux · Accepted Answer · 2020-05-13 02:09:17Z

1

Detect and count the beginning of words, the space to non-space transition:

int count_words = 0;
bool begin = true;
for (int i = 0, n = strlen(text); i < n; i++) {
  if (isspace (text[i])) {
    begin = true;
  } else {
    if (begin) count_words++;
    begin = false;
  }
}

edited May 13, 2020 at 2:09

answered May 12, 2020 at 20:13

chux

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1 Comment

Patrick Dankyi Over a year ago

can you please explain to me what you did?

jai · Accepted Answer · 2020-05-12 19:13:43Z

0

Try this condition to count words:

if(text[i]!=' ' && text[i+1]==' ')
        Count=count+1;

answered May 12, 2020 at 19:13

jai

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5 Comments

Patrick Dankyi Over a year ago

If you don't mind explaining what you did? It works, but I don't see why?

jai Over a year ago

bro i have placed the condition for checking "not a space" and "space after our word" so that we can slice out the word.

jai Over a year ago

Conditon is : check if there is "not a space" at i. Then check if there is a space after i , if its true that means we have sliced out our word. If you still dont get it let me know.

jai Over a year ago

Dont forget to Mark the answer correct only if you find it helpful.

chux Over a year ago

If the input does not contain any spaces like "Hello", this approach will report 0 rather than 1.

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