strtok给出了空字符串或我不知道的东西

Question

I have the following source-code:

#include <stdio.h>
#include <time.h>
#include <string.h>

int main(int argc, char *argv[])
{

    char string[100];
    printf("Give me some text. \n");
    fgets(string, 100, stdin);

    char delimiter[]=" ";
    char *erg;

    erg=strtok(string, delimiter);

    while(erg != NULL){
        printf("Wort: %s \n", erg);

        erg=strtok(NULL, delimiter);
    }

    return 0;
}

When I for example put in the text "abc def", the program is working like I want it to work. It print out the words "abc" and "def". But when I put in the text "abc def ", it prints out "abc", "def" and "". I don't want to print out the last empty "". Can someone please tell me how to filter that ?

Gruß, Andre

Answer 1

IMO, you need to get rid of the last \\n read by fgets() in fgets(string, 100, stdin);

You can do this in many ways, like

1. include the \\n in your delimiter list. " \\n" , for example.
2. manually check the length of string, and at the last position, replace the \\n with a \\0 .

Answer 2

fgets gets a whole string along with the \\n character which you press after entering the string.So use

string[strlen(string)-1]='\0';

to replace the \\n in string with a \\0 .