CODEWITHSUNDEEP
c
Sim
Sim

Reputation: 101

How to avoid printing (null)?

I'm trying to print these tokens but I keep printing (null) at the end. This is the null pointer but I thought I accounted for this in the while loop. Edit: Oh, I'm not trying to print the first string in input. I'm trying to print everything after the first input but I keep printing that (null)

input = strtok(input_buffer, "\n ")
while (input != NULL)
{
   input = strtok(NULL, "\n");
   printf("%s", input);
}
printf("\n");

Upvotes: 1

Views: 1845

Answers (5)

Bhuvanesh
Bhuvanesh

Reputation: 1279

After separating a string your printing the string, so the previous string will be lose , so print the string before separate on next time.

    input = strtok(input_buffer, "\n  ");
    while (input != NULL)
   {
   printf("%s", input);
   input = strtok(NULL, "\n");

  }
   printf("\n");

Upvotes: 1

Prav001
Prav001

Reputation: 355

You are first assigning values to variable input and then printing it.Remember, you are changing the value of input inside while loop.Just interchange 4th and 5th line. Try this: 

input = strtok(input_buffer, "\n ")
while (input != NULL)
                {
                    printf("%s", input);
                    input = strtok(NULL, "\n");
                }
                printf("\n");

Upvotes: 1

user4098326
user4098326

Reputation: 1742

You can also use a for loop:

for(input = strtok(input_buffer, "\n ");input != NULL;input = strtok(NULL, "\n"))
{
    // Print first.
    printf("%s", input);
}
printf("\n");

Upvotes: 2

R Sahu
R Sahu

Reputation: 206567

Adjust the order of things a bit.

input = strtok(input_buffer, "\n ")
while (input != NULL)
{
    // Print first.
    printf("%s", input);
    input = strtok(NULL, "\n");
}
printf("\n");

Upvotes: 2

user3386109
user3386109

Reputation: 34829

Switch the order of the printf/strtok in the loop, since you already have the first token from outside the loop

input = strtok(input_buffer, "\n ")
while (input != NULL)
{
    printf("%s", input);
    input = strtok(NULL, "\n");
}
printf("\n");

Upvotes: 2

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