CODEWITHSUNDEEP
carraysstrlen
mainajaved
mainajaved

Reputation: 8173

strlen function giving wrong value

hello every one I have written code

char sentence[100]; 
scanf("%s" ,sentence); 
char * ptrs = sentence ;
printf("%d", strlen(ptrs));

suppose I enter 

john is a boy

the strlen() function is giving me value 4 it stops counting after space what I should do thanks

Upvotes: 4

Views: 5532

Answers (3)

varunl
varunl

Reputation: 20229

fgets() instead of scanf().
scanf() takes the input to the end of the word.

Debugging Tips:

You should have been able to debug to some extent on your own. When strlen() wasn't giving correct answer, the first thing to do would be to verify your assumptions. You were assuming that sentence/ptrs had the correct value. A simple printf would have proved it wrong.

Upvotes: 1

Karoly Horvath
Karoly Horvath

Reputation: 96258

That scanf will read only one word, if you do a printf you will see it. So there is nothing wrong with strlen.

Use fgets which reads a whole line:

if (! fgets(sentence, sizeof(sentence), stdin)) {
   fprintf(stderr, "error or end  of file while no characters have been read\n");
   return;
}

Upvotes: 9

Shamim Hafiz - MSFT
Shamim Hafiz - MSFT

Reputation: 22094

scanf("%s" ,sentence);

This will only read a string up to the next space. That means, the remaining characters, hence words after john is not read.

To get your desired output, use gets() instead.

gets(sentence);

Upvotes: 1

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