CODEWITHSUNDEEP
c
Flow-MH
Flow-MH

Reputation: 71

strcasecmp is not returning zero

I want to know why strcasecmp() is returning 0 the first time I use it but not the second.

In this example i'm specifically entering "hello world" into standard input. Instead of printing 0 0 it's printing 0 10. I have the following code.

#include "stdio.h"
#include "string.h"

int main(void) {

  char input[1000];
  char *a;

  fgets(input, 1000, stdin);

  a = strtok(input, " ");
  printf("%d\n",strcasecmp(a,"hello"));  //returns 0 

  a = strtok(NULL, " ");
  printf("%d\n",strcasecmp(a,"world"));  //returns 10


  return 0;
}

What am I doing wrong?

Upvotes: 3

Views: 516

Answers (1)

Marian
Marian

Reputation: 7482

The newline, you have entered after hello world is part of the world token because you use space as token separator.

If you use strtok(input, " \n"); instead of strtok(input, " "); the program will behave correctly. In fact, you probably want to use tabulator as token separator as well.

The whole program will be:

#include "stdio.h"
#include "string.h"

int main(void) {

  char input[1000];
  char *a;

  fgets(input, 1000, stdin);

  a = strtok(input, " \n\t");
  if (a == NULL) return(-1);
  printf("%d\n",strcasecmp(a,"hello"));
  a = strtok(NULL, " \n\t");
  if (a == NULL) return(-1);
  printf("%d\n",strcasecmp(a,"world")); 


  return 0;
}

Upvotes: 6

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